Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Seattle to London Heathrow Airport from C$ 555

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — LHR
1 May — 8 May1
1 adult
Wed 1/5
Wed 8/5

The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in February or January, booked 62 days in advance, depart on a Tuesday or Saturday and return on a Wednesday

Cheap flight deals from Seattle to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 26 April 2024.

Popular in

June

Cheapest in

February

Round-trip from

C$ 757

One-way from

C$ 555
High demand for flights, 24% potential price rise
Search Deals
Best time to find cheap flights, 23% potential price drop
Search Deals
From Seattle/Tacoma Intl to London Heathrow
Search Deals
One-way flight from Seattle/Tacoma Intl to London Heathrow
Search Deals

What is the cheapest day to fly round-trip from Seattle to London Heathrow Airport?

Users have found that flying from Seattle to London Heathrow Airport on a Wednesday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

How far in advance should I book a flight from Seattle to London Heathrow Airport?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 59 days in advance, which can save you up to 39% on flights from Seattle to London Heathrow Airport compared to booking the week you need them. Waiting 59 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at C$ 1,183. For sooner than that we have options available in the next 3 days from C$ 1,563.

What is the cheapest month to fly from Seattle to London Heathrow Airport?

January is one of the best times of the year to fly to London Heathrow Airport from Seattle. Prices for January average C$ 1,175 per person but you can even find prices for as low as C$ 631. The most expensive prices can be found in the month of June. Opting for a January flight can save you 32% on your journey compared to booking in June

When is the cheapest time to fly from Seattle to London Heathrow Airport (SEA - LHR)?

Unlike in the morning, when flights are generally more expensive, you can save up to 25% on flights from Seattle to London Heathrow Airport by exploring options for tickets in the afternoon.

Cheap Virgin Atlantic flights from Seattle to Heathrow

Explore cheap flight options specifically provided by Virgin Atlantic for the route between Seattle and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.
Peruse some of the lowest-priced Virgin Atlantic flights we've found from Seattle to London. It's recommended that users confirm their flight details before booking.
Thu 25/79:15 p.m.SEA - LHR
Nonstop9h 35mVirgin Atlantic
Wed 30/108:25 p.m.LHR - SEA
1 stop21h 50mVirgin Atlantic
Deal found 25/4C$ 1,065
Thu 2/54:30 p.m.SEA - LHR
Nonstop9h 20mVirgin Atlantic
Thu 9/56:15 a.m.LHR - SEA
1 stop13h 05mVirgin Atlantic
Deal found 25/4C$ 1,161
Thu 2/54:30 p.m.SEA - LHR
Nonstop9h 20mVirgin Atlantic
Tue 7/56:15 a.m.LHR - SEA
1 stop13h 05mVirgin Atlantic
Deal found 25/4C$ 1,319

  • Virgin Atlantic is one of the most popular airlines used for those travelling from Seattle to London Heathrow Airport. Seattle to London Heathrow Airport flights are typically 136% cheaper than other airlines traveling the same route. Flights from Virgin Atlantic typically cost C$ 784.79 RT. The cheapest Virgin Atlantic flight found for this route was C$ 658. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to London Heathrow Airport. London Heathrow Airport is the most popular arrival airport in London Heathrow Airport. When flying from Seattle to London Heathrow Airport, Virgin Atlantic flights are 8% more popular than any other airline flying that same route.

Cheap KLM flights from Seattle to Heathrow

Explore cheap flight options specifically provided by KLM for the route between Seattle and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.
Take a gander at the lowest prices we've found on KLM flights from Seattle to London. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Thu 25/79:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Wed 30/104:35 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 25/4C$ 1,072
Wed 8/59:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Wed 15/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 25/4C$ 1,091
Tue 30/47:30 p.m.SEA - LHR
Nonstop9h 45mKLM
Fri 17/511:45 a.m.LHR - SEA
1 stop12h 55mKLM
Deal found 25/4C$ 1,097
Tue 30/47:30 p.m.SEA - LHR
Nonstop9h 45mKLM
Fri 17/511:45 a.m.LHR - SEA
1 stop12h 55mKLM
Deal found 26/4C$ 1,098
Tue 30/47:30 p.m.SEA - LHR
Nonstop9h 45mKLM
Tue 7/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 25/4C$ 1,102
Tue 30/47:30 p.m.SEA - LHR
Nonstop9h 45mKLM
Fri 17/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 26/4C$ 1,104
Fri 10/59:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Mon 20/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 25/4C$ 1,228
Thu 16/59:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Sun 19/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 26/4C$ 1,229
Tue 18/69:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Tue 10/94:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 25/4C$ 1,259

  • KLM is one of the most popular airlines used for those travelling from Seattle to London Heathrow Airport. Seattle to London Heathrow Airport flights are typically 154% more expensive than other airlines travelling the same route. Flights from KLM typically cost C$ 697.47 RT. The cheapest KLM flight found for this route was C$ 603. The most popular departure airport in Seattle when flying to London Heathrow Airport is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London Heathrow Airport is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, KLM flights are 4% more popular than any other airline flying that same route.

Cheap Seattle to Heathrow flights in April & May 2024

Find cheap flight options from Seattle to Heathrow specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 508,915 searches. Prices were last updated on 26 April 2024.
These are some of the best deals we've found on flights to London in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Tue 14/56:55 p.m.SEA - LHR
1 stop17h 25mIcelandair
Sat 18/51:05 p.m.LHR - SEA
1 stop12h 35mIcelandair
Deal found 25/4C$ 992
Sat 4/51:30 p.m.SEA - LHR
2 stops18h 30mMultiple Airlines
Mon 6/56:40 a.m.LHR - SEA
2 stops23h 44mMultiple Airlines
Deal found 25/4C$ 1,033
Fri 10/56:55 p.m.SEA - LHR
1 stop17h 25mIcelandair
Fri 17/51:05 p.m.LHR - SEA
1 stop15h 30mIcelandair
Deal found 25/4C$ 1,060
Tue 14/59:10 p.m.SEA - LHR
Nonstop9h 40mDelta
Tue 21/511:30 a.m.LHR - SEA
1 stop14h 10mDelta
Deal found 25/4C$ 1,082
Sun 12/54:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Tue 21/56:15 a.m.LHR - SEA
1 stop13h 05mDelta
Deal found 25/4C$ 1,083
Sun 12/59:10 p.m.SEA - LHR
Nonstop9h 40mDelta
Wed 22/58:40 a.m.LHR - SEA
1 stop16h 00mDelta
Deal found 25/4C$ 1,085
Sat 11/510:56 p.m.SEA - LHR
1 stop13h 14mDelta
Tue 21/511:30 a.m.LHR - SEA
1 stop14h 10mDelta
Deal found 25/4C$ 1,089
Wed 15/59:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Wed 22/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 25/4C$ 1,091
Sun 28/44:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Tue 7/56:15 a.m.LHR - SEA
1 stop13h 05mDelta
Deal found 25/4C$ 1,094

Seattle to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.
These are some of the best deals we've found on flights to London in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Mon 30/93:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Thu 17/101:10 p.m.LHR - SEA
1 stop12h 45mIcelandair
Deal found 25/4C$ 859
Mon 30/93:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Wed 23/101:05 p.m.LHR - SEA
1 stop12h 50mIcelandair
Deal found 26/4C$ 861
Sun 29/93:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Thu 17/101:10 p.m.LHR - SEA
1 stop12h 45mIcelandair
Deal found 25/4C$ 867
Sun 29/96:55 p.m.SEA - LHR
1 stop17h 25mIcelandair
Wed 23/101:05 p.m.LHR - SEA
1 stop12h 50mIcelandair
Deal found 26/4C$ 869
Tue 1/1010:40 a.m.SEA - LHR
2 stops17h 10mLufthansa
Fri 25/109:00 a.m.LHR - SEA
2 stops21h 20mLufthansa
Deal found 24/4C$ 873
Tue 5/119:55 a.m.SEA - LHR
2 stops16h 15mLufthansa
Thu 14/117:40 a.m.LHR - SEA
1 stop17h 25mLufthansa
Deal found 26/4C$ 874
Tue 1/105:00 a.m.SEA - LHR
1 stop20h 40mMultiple Airlines
Fri 25/1010:50 a.m.LHR - SEA
1 stop14h 09mMultiple Airlines
Deal found 24/4C$ 878
Wed 2/106:45 a.m.SEA - LHR
2 stops17h 45mUnited Airlines
Fri 18/109:00 a.m.LHR - SEA
1 stop15h 59mUnited Airlines
Deal found 25/4C$ 880
Tue 1/1011:59 p.m.SEA - LHR
1 stop27h 36mMultiple Airlines
Tue 22/102:10 p.m.LHR - SEA
1 stop27h 55mMultiple Airlines
Deal found 24/4C$ 881

Direct flights to Heathrow from Seattle

Discover non-stop flight options from Seattle to Heathrow. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.
To help reduce your travel time, choose from one of these non-stop flights from Seattle to London. Those looking to potentially save on 1 or 2-stop flights from Seattle to London should utilize the search form at the top of the page.
Tue 1/109:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Fri 25/104:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 24/4C$ 891
Tue 1/107:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Fri 18/109:50 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 26/4C$ 892
Sat 28/97:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 15/109:50 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 25/4C$ 959
Sat 5/107:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 15/109:50 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 26/4C$ 960
Sun 29/97:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Sun 13/109:45 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 25/4C$ 971
Fri 4/101:30 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 22/109:50 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 26/4C$ 973
Mon 12/89:15 p.m.SEA - LHR
Nonstop9h 35mDelta
Wed 28/812:45 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 25/4C$ 983
Tue 20/89:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Tue 27/84:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 26/4C$ 985
Mon 26/89:15 p.m.SEA - LHR
Nonstop9h 35mDelta
Wed 4/94:50 p.m.LHR - SEA
Nonstop10h 30mDelta
Deal found 25/4C$ 1,004

Seattle to Heathrow flights leaving soon

Find last-minute flight options from Seattle to Heathrow for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.
Have a look at some of the flights available from Seattle to London departing last-minute. It's wise to confirm all flight details are correct before booking.
Sat 4/51:30 p.m.SEA - LHR
2 stops18h 30mMultiple Airlines
Mon 6/56:40 a.m.LHR - SEA
2 stops23h 44mMultiple Airlines
Deal found 25/4C$ 1,033
Fri 10/56:55 p.m.SEA - LHR
1 stop17h 25mIcelandair
Fri 17/51:05 p.m.LHR - SEA
1 stop15h 30mIcelandair
Deal found 25/4C$ 1,060
Wed 8/59:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Wed 15/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 25/4C$ 1,091
Sun 28/44:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Tue 7/56:15 a.m.LHR - SEA
1 stop13h 05mDelta
Deal found 25/4C$ 1,094
Sun 28/44:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Tue 14/56:15 a.m.LHR - SEA
1 stop13h 05mDelta
Deal found 26/4C$ 1,095
Tue 30/47:30 p.m.SEA - LHR
Nonstop9h 45mKLM
Fri 17/511:45 a.m.LHR - SEA
1 stop12h 55mKLM
Deal found 25/4C$ 1,097
Tue 30/47:30 p.m.SEA - LHR
Nonstop9h 45mKLM
Fri 17/511:45 a.m.LHR - SEA
1 stop12h 55mKLM
Deal found 26/4C$ 1,098
Mon 29/412:35 a.m.SEA - LHR
1 stop22h 40mDelta
Wed 8/59:00 a.m.LHR - SEA
1 stop16h 40mDelta
Deal found 25/4C$ 1,100
Sat 27/411:06 p.m.SEA - LHR
1 stop13h 04mDelta
Tue 7/56:15 a.m.LHR - SEA
1 stop13h 05mDelta
Deal found 25/4C$ 1,101

One-way flights to Heathrow from Seattle

Search for one-way flight options from Seattle to Heathrow. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.
Some of the best available deals we've found on one-way flights from Seattle to London. Those seeking round-trip flights from Seattle to London should utilize the search form at the top of the page.
Sat 24/811:00 p.m.SEA - LHR
1 stop13h 20mIcelandair
Deal found 25/4C$ 555
Tue 8/109:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Deal found 26/4C$ 646
Mon 7/1012:35 a.m.SEA - LHR
1 stop22h 40mDelta
Deal found 26/4C$ 652
Thu 19/99:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Deal found 25/4C$ 714
Wed 10/79:26 a.m.SEA - LHR
2 stops18h 39mWestJet
Deal found 25/4C$ 773
Tue 6/85:45 p.m.SEA - LHR
2 stops34h 20mWestJet
Deal found 26/4C$ 783
Tue 28/57:22 a.m.SEA - LHR
2 stops20h 43mWestJet
Deal found 24/4C$ 799
Fri 5/79:55 p.m.SEA - LHR
2 stops30h 05mWestJet
Deal found 25/4C$ 803
Tue 6/87:25 a.m.SEA - LHR
2 stops20h 40mWestJet
Deal found 25/4C$ 822

Find flights from Seattle to Heathrow within your budget

Customize your flight search to find flights from Seattle to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 992 - C$ 1,141

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 14/5

1 stop17h 25m

London Heathrow

Sat 18/5

1 stop12h 35m

C$ 992

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 4/5

2 stops18h 30m

London Heathrow

Mon 6/5

2 stops23h 44m

C$ 1,033

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 25/7

Nonstop9h 35m

London Heathrow

Wed 30/10

1 stop21h 50m

C$ 1,065

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 25/7

Nonstop9h 35m

London Heathrow

Wed 30/10

Nonstop10h 25m

C$ 1,072

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 14/5

Nonstop9h 40m

London Heathrow

Tue 21/5

1 stop14h 10m

C$ 1,082

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 14/5

2 stops22h 15m

London Heathrow

Tue 21/5

2 stops24h 27m

C$ 1,115

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 1/5

2 stops15h 51m

London Heathrow

Tue 14/5

1 stop13h 55m

C$ 1,116

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 10/5

2 stops55h 20m

London Heathrow

Mon 20/5

1 stop35h 55m

C$ 1,121

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 7/5

1 stop18h 10m

London Heathrow

Tue 28/5

1 stop26h 20m

C$ 1,141

Flights are sorted by cheapest first

Deals found on 25/4

When is the best time to book a flight from Seattle to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Heathrow. Price data was last updated on 28 January 2024.
The best time to book flights from Seattle to London Heathrow Airport is 62 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Search Deals

When is the cheapest time to fly from Seattle to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Heathrow. Price data was last updated on 21 April 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to London Heathrow Airport flight should consider departing on Saturday evenings when fares are most often at their lowest. Thursday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Heathrow by month

Plan your trip from Seattle to Heathrow by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Heathrow is currently C$ 727 while a round-trip flight costs C$ 1,082. Price data was last updated on 21 April 2024.

Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of C$ 560). Flying from Seattle to London Heathrow Airport in July is currently the most expensive (average of C$ 941). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

C$ 765

February

C$ 836

March

C$ 927

April

C$ 914

May

C$ 992

June

C$ 1,102

July

C$ 1,285

August

C$ 1,112

September

C$ 989

October

C$ 917

November

C$ 900

December

C$ 985

Temperature and rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature and rainfall totals by month.

LON

Temperature

4 - 17 °C

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 26 April 2024.
To help decide which airline to fly from Seattle to London, see what other customers have to say about Virgin Atlantic, KLM and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,966 reviews
Check prices

Crew

8.6

Comfort

7.9

Entertainment

8.0

Overall

8.1

Boarding

8.2

Food

7.4

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Delta
8.1
Very good
10,966 reviews
Delta
8.1
Very good
10,966 reviews
Check prices

Crew

8.6

Comfort

7.9

Entertainment

8.0

Overall

8.1

Boarding

8.2

Food

7.4

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

KLM
7.9
Good
1,626 reviews
Delta
8.1
Very good
10,966 reviews
Check prices

Crew

8.6

Comfort

7.9

Entertainment

8.0

Overall

8.1

Boarding

8.2

Food

7.4

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

SWISS
7.8
Good
2,061 reviews
Delta
8.1
Very good
10,966 reviews
Check prices

Crew

8.6

Comfort

7.9

Entertainment

8.0

Overall

8.1

Boarding

8.2

Food

7.4

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Finnair
7.8
Good
1,385 reviews
Delta
8.1
Very good
10,966 reviews
Check prices

Crew

8.6

Comfort

7.9

Entertainment

8.0

Overall

8.1

Boarding

8.2

Food

7.4

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Virgin Atlantic
7.7
Good
746 reviews
Delta
8.1
Very good
10,966 reviews
Check prices

Crew

8.6

Comfort

7.9

Entertainment

8.0

Overall

8.1

Boarding

8.2

Food

7.4

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to London Heathrow?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to London Heathrow. You should not have trouble finding flights to London Heathrow from Seattle/Tacoma Intl; the airport handles an average of 19 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 6 airlines have flights from the Seattle airport to London Heathrow. It is only a 18.4 km journey to Seattle/Tacoma Intl (SEA) from Seattle’s city centre.

  • Can I find flights from Seattle to London Heathrow Airport for under C$ 1,000 on Cheapflights?

    Yes, there are multiple flights from Seattle to London Heathrow Airport for under C$ 1,000. The cheapest flight booked recently is on Icelandair for just C$ 992, but on average you can expect to pay C$ 1,083.

  • Are there direct flights from Seattle to London Heathrow Airport for under C$ 900 on Cheapflights?

    Cheapflights has 20 direct flights from Seattle to London Heathrow Airport under C$ 900. A good price for a direct flight from Seattle to London Heathrow Airport is less than C$ 998.

  • Are there last-minute flights available from Seattle to London Heathrow Airport for under C$ 1,100?

    There are currently 20+ open flights from Seattle to London Heathrow Airport within the next 7 days for less than C$ 1,100.

  • What are the cheapest airlines flying from Seattle to London Heathrow Airport round-trip?

    Flying on Icelandair is currently your cheapest option to London Heathrow Airport, with prices starting at C$ 992. Additional round-trip tickets that might be worth considering are offered by Virgin Atlantic and KLM, with the lowest prices starting at C$ 1,065 and C$ 1,072, respectively. Users have found that Icelandair is 18% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to London Heathrow Airport one-way?

    One-way options have recently been found by users for as low as C$ 555 on Icelandair. Other airlines that offer cheap prices include KLM from C$ 646 and Delta from C$ 652 one-way.

  • What are the most popular airlines that fly from Seattle to London Heathrow Airport?

    When booking a flight from Seattle to London Heathrow Airport, you may want to consider flying on Finnair, British Airways or Delta as they are the most popular for this route.

  • What are the most reliable airlines from Seattle to London Heathrow Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to London Heathrow Airport on time: Air France (78%), Delta (78%), KLM (78%).

  • What are the cheapest flights from Seattle to London Heathrow Airport?

    While on average a flight from Seattle to London Heathrow Airport is generally C$ 1,016, our data shows the cheapest flight currently is C$ 647. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay C$ 930 for that flight.

  • What does SEA to LHR mean?

    Seattle/Tacoma Intl Airport is SEA and London Heathrow Airport is LHR. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

  • Can I find deals for flights from Seattle to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Heathrow flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Heathrow flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Heathrow that include hotel bookings?

    Yes. In addition to deals on Seattle to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Heathrow.

  • Can I find deals for business class flights from Seattle to Heathrow?

    Yes. Cheapflights offers flight deals from Seattle to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Heathrow that allow pets onboard?

    Many airlines flying from Seattle to Heathrow offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Heathrow?

    Yes, you can often find last-minute deals on Seattle to Heathrow flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to London Heathrow Airport flight deals updated?

    The Seattle to London Heathrow Airport flight deals you see on this page were last updated on 26/4.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.

Seattle to Gatwick flights

Top 6 airlines flying from Seattle to Heathrow

Discover the top 6 airlines that operate flights from Seattle to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 508,915 searches. Data last updated 26 April 2024.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapestC$ 666AverageC$ 1,114FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapestC$ 744AverageC$ 1,068FlexibilityNo cancel feeOn-time77%
Search Iberia flights
FinnairCheapestC$ 824AverageC$ 953FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapestC$ 853AverageC$ 1,199FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapestC$ 899AverageC$ 1,072FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapestC$ 953AverageC$ 1,308FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Ottawa to San Francisco flights
Toronto to Manila flights
Toronto to Havana flights
Toronto to Boston flights
Abbotsford to Calgary flights
Montreal to Los Angeles flights
Winnipeg to Hawaii flights
Seattle to Calgary flights
Vancouver to India flights
Toronto to Nairobi flights
Toronto to Los Cabos flights
Seattle to Lihue flights

Search flights from Seattle to Heathrow by cabin class

Find flights from Seattle to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from Seattle to Heathrow

Find hourly flight availability from Seattle to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 April 2024.
0%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
40%of flight departuresAfternoonNoon to 6 pm
60%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to Heathrow

Explore weekly flight availability from Seattle to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 26 April 2024.
Sunday20daily flights
Monday20daily flights
Tuesday15daily flights
Wednesday20daily flights
Thursday20daily flights
Friday20daily flights
Saturday20daily flights

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Corfu Ioannis Kapodistrias
Flights to Milas–Bodrum
Flights to Nuuk
Flights to Bodø
Flights to Dalaman
Flights to Belp
Flights to Zakynthos Dionsios Salomos
Flights to Gaziantep
Flights to Butuan
Flights to Genoa Cristoforo Colombo
Flights to Alexandria Borg El Arab
Flights to Grand Junction Regnl
Flights to Chittagong Patenga
Flights to Konya
Flights to La Paz El Alto Intl
Flights to Lexington Blue Grass
Flights to Coimbatore Peelamedu
Flights to Dumaguete City
Flights to Nevsehir
Flights to Maracaibo La Chinita
Flights to Atlantic City
Flights to Košice Barca
Flights to Darwin
Flights to Alghero-Fertilia

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Heathrow?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Seattle today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Seattle to Heathrow?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Heathrow with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Heathrow flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Seattle to Heathrow become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines