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Cheap flights from Seattle to London from C$ 380

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight to London departing on 20/3. 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 — LON
3 Mar — 10 Mar1
1 adult
Sun 3/3
Sun 10/3

The best prices from Seattle/Tacoma Intl to London are usually found in January or February, booked 58 days in advance, depart on a Wednesday or Saturday and return on a Tuesday

Cheap flight deals from Seattle to London

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to London (LON). 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 27 February 2024.

Popular in

June

Cheapest in

January

Round-trip from

C$ 1,011

One-way from

C$ 561
High demand for flights, 24% potential price rise
Best time to find cheap flights, 22% potential price drop
From Seattle/Tacoma Intl to London (LON)
One-way flight from Seattle/Tacoma Intl to London (LON)

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

Tuesday is generally a great day to depart. Flying on this day could help you save up to 28%.

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

To save up to 39% on this flight, we recommend booking at least 59 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Seattle to London from C$ 1,170 1-2 weeks out and tickets from C$ 1,546 for flights departing within the next 72 hours.

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

January is one of the best times of the year to fly to London from Seattle. Prices for January average C$ 1,163 per person but you can even find prices for as low as C$ 624. 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 (SEA - LON)?

It’s optimal to fly from Seattle to London in the afternoon. By choosing this option you can save up to 6% on the cost of your flight, compared to a flight at noon.

Cheap Icelandair flights from Seattle to London

Explore cheap flight options specifically provided by Icelandair for the route between Seattle and London. 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 603,145 searches. Data last updated 27 February 2024.
Find some of the cheapest Icelandair flights travelling from Seattle to London. Make sure to double check the flight details before booking.
Wed 24/43:50 p.m.SEA - LHR
1 stop20h 30mIcelandair
Sat 18/59:25 p.m.LHR - SEA
1 stop31h 10mIcelandair
Deal found 26/2C$ 793
Tue 9/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Fri 19/41:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 27/2C$ 809
Sat 13/44:25 p.m.SEA - LHR
1 stop19h 55mIcelandair
Thu 18/41:10 p.m.LHR - SEA
1 stop12h 30mIcelandair
Deal found 27/2C$ 812
Tue 23/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Fri 17/51:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 26/2C$ 816
Sun 14/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Thu 16/51:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 26/2C$ 818
Sun 21/43:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Thu 16/51:10 p.m.LHR - SEA
1 stop12h 30mIcelandair
Deal found 26/2C$ 819
Sun 14/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Fri 26/41:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 27/2C$ 830
Sat 13/44:25 p.m.SEA - LHR
1 stop19h 55mIcelandair
Wed 24/41:05 p.m.LHR - SEA
1 stop12h 35mIcelandair
Deal found 27/2C$ 832
Wed 24/43:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Thu 16/51:10 p.m.LHR - SEA
1 stop12h 30mIcelandair
Deal found 26/2C$ 839
  • One of the most popular airlines travelling from Seattle to London is Icelandair. Flights on this route from Icelandair typically cost C$ 814.65 RT, a price that is 97% cheaper than the average Seattle to London flight. The cheapest flight found was C$ 659 RT. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to London. London Heathrow Airport is the most popular arrival airport in London. When flying from Seattle to London, Icelandair flights are 9% more popular than any other airline flying that same route.

Cheap Air Canada flights from Seattle to London

Explore cheap flight options specifically provided by Air Canada for the route between Seattle and London. 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 603,145 searches. Data last updated 27 February 2024.
To aid your search, here are some of the cheapest Air Canada flights we've found from Seattle to London. Deals are refreshing constantly so come back soon for more options.
Sun 21/43:20 p.m.SEA - LHR
1 stop14h 00mAir Canada
Tue 21/59:30 a.m.LHR - SEA
2 stops16h 57mAir Canada
Deal found 26/2C$ 843
Thu 25/43:20 p.m.SEA - LHR
1 stop14h 00mAir Canada
Tue 21/59:30 a.m.LHR - SEA
2 stops16h 57mAir Canada
Deal found 26/2C$ 911
Tue 12/39:55 a.m.SEA - LHR
1 stop18h 55mAir Canada
Wed 27/33:00 p.m.LHR - SEA
2 stops25h 16mAir Canada
Deal found 26/2C$ 1,005
Tue 12/33:20 p.m.SEA - LHR
1 stop13h 30mAir Canada
Mon 25/31:00 p.m.LHR - SEA
2 stops27h 16mAir Canada
Deal found 26/2C$ 1,100
  • If you’re travelling from Seattle to London, one of the more common airlines travelling that route is Air Canada. Flights from Air Canada travelling this route typically cost C$ 697.47 RT. This price is typically 121% cheaper than other airlines that offer Seattle to London flights. When booking this route, the cheapest RT price found was C$ 603. When travelling from Seattle to London on Air Canada, the most popular airport to depart from is Seattle/Tacoma Intl Airport and the most popular airport to arrive at is London Heathrow Airport. When flying from Seattle to London, Air Canada flights are 4% more popular than any other airline flying that same route.

Cheap Seattle to London flights in February & March 2024

Find cheap flight options from Seattle to London specifically for the months of February and March 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 603,145 searches. Prices were last updated on 27 February 2024.
The lowest fares we've come across on flights travelling from Seattle to London in February and March 2024. More deals are always being added, so be sure to check back regularly.
Wed 27/33:20 p.m.SEA - LHR
1 stop13h 30mLufthansa
Fri 12/42:10 p.m.LHR - SEA
1 stop12h 17mLufthansa
Deal found 27/2C$ 846
Mon 4/36:45 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 19/39:25 a.m.LHR - SEA
Nonstop10h 00mBritish Airways
Deal found 27/2C$ 847
Tue 12/36:00 a.m.SEA - LHR
1 stop18h 00mAmerican Airlines
Tue 26/38:20 a.m.LHR - SEA
1 stop16h 53mAmerican Airlines
Deal found 26/2C$ 849
Wed 13/37:17 a.m.SEA - LHR
1 stop17h 03mAmerican Airlines
Tue 26/311:45 a.m.LHR - SEA
1 stop16h 29mAmerican Airlines
Deal found 26/2C$ 851
Tue 27/27:17 a.m.SEA - LHR
1 stop15h 03mFinnair
Thu 7/32:50 p.m.LHR - SEA
Nonstop9h 55mFinnair
Deal found 27/2C$ 853
Wed 13/37:45 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 26/39:25 a.m.LHR - SEA
1 stop17h 07mBritish Airways
Deal found 26/2C$ 857
Wed 20/37:17 a.m.SEA - LHR
1 stop17h 03mAmerican Airlines
Fri 29/38:40 a.m.LHR - SEA
1 stop20h 30mAmerican Airlines
Deal found 25/2C$ 861
Wed 13/37:17 a.m.SEA - LHR
1 stop16h 03mIberia
Wed 27/39:25 a.m.LHR - SEA
1 stop19h 14mIberia
Deal found 26/2C$ 863
Sun 31/39:55 a.m.SEA - LHR
1 stop19h 25mLufthansa
Wed 10/47:25 a.m.LHR - SEA
2 stops37h 12mLufthansa
Deal found 26/2C$ 868

Seattle to London 2024 flight deals

Discover exclusive flight deals for travel between Seattle and London in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 603,145 searches. Data last updated 27 February 2024.
The lowest fares we've come across on flights travelling from Seattle to London in February and March 2024. More deals are always being added, so be sure to check back regularly.
Wed 24/43:50 p.m.SEA - LHR
1 stop20h 30mIcelandair
Sat 18/59:25 p.m.LHR - SEA
1 stop31h 10mIcelandair
Deal found 26/2C$ 793
Tue 9/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Fri 19/41:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 27/2C$ 809
Sat 13/44:25 p.m.SEA - LHR
1 stop19h 55mIcelandair
Thu 18/41:10 p.m.LHR - SEA
1 stop12h 30mIcelandair
Deal found 27/2C$ 812
Tue 23/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Fri 17/51:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 26/2C$ 816
Sun 14/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Thu 16/51:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 26/2C$ 818
Sun 21/43:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Fri 17/51:05 p.m.LHR - SEA
1 stop15h 30mIcelandair
Deal found 26/2C$ 819
Wed 25/910:40 a.m.SEA - LHR
2 stops17h 10mLufthansa
Fri 18/1010:50 a.m.LHR - SEA
1 stop14h 09mLufthansa
Deal found 27/2C$ 827
Sun 14/43:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Fri 26/41:00 p.m.LGW - SEA
1 stop12h 40mIcelandair
Deal found 27/2C$ 830
Sun 21/41:10 p.m.SEA - LHR
1 stop16h 10mMultiple Airlines
Wed 15/56:30 a.m.LHR - SEA
2 stops15h 57mMultiple Airlines
Deal found 26/2C$ 830

Direct flights to London from Seattle

Discover non-stop flight options from Seattle to London. 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 603,145 searches. Data last updated 27 February 2024.
For a shorter flight, select one of these non-stop flights from Seattle to London. Select from other flights from Seattle to London by using the search form above.
Sun 21/47:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Fri 17/59:50 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 26/2C$ 845
Wed 13/35:15 p.m.SEA - LHR
Nonstop9h 25mDelta
Wed 27/312:25 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 26/2C$ 884
Wed 13/35:15 p.m.SEA - LHR
Nonstop9h 25mDelta
Wed 20/312:25 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 27/2C$ 886
Wed 17/47:45 p.m.SEA - LHR
Nonstop9h 45mDelta
Thu 25/412:45 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 27/2C$ 888
Tue 23/47:40 p.m.SEA - LHR
Nonstop9h 20mIberia
Thu 16/59:45 a.m.LHR - SEA
Nonstop9h 45mIberia
Deal found 26/2C$ 901
Wed 17/47:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 14/59:50 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 26/2C$ 904
Tue 30/44:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Fri 17/512:45 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 27/2C$ 908
Thu 2/57:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Thu 9/59:45 a.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 26/2C$ 935
Sun 14/41:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Wed 24/44:00 p.m.LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 27/2C$ 945

Seattle to London flights leaving soon

Find last-minute flight options from Seattle to London 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 603,145 searches. Data last updated 27 February 2024.
Users seeking a last-minute flight from Seattle to London should consider booking one of these fares. To prevent any unwanted surprises, users should verify their flight info before booking.
Mon 4/36:45 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 19/39:25 a.m.LHR - SEA
Nonstop10h 00mBritish Airways
Deal found 27/2C$ 847
Tue 12/36:00 a.m.SEA - LHR
1 stop18h 00mAmerican Airlines
Tue 26/38:20 a.m.LHR - SEA
1 stop16h 53mAmerican Airlines
Deal found 26/2C$ 849
Tue 12/37:45 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Tue 26/38:20 a.m.LHR - SEA
1 stop16h 53mBritish Airways
Deal found 26/2C$ 857
Tue 12/36:55 p.m.SEA - LHR
Nonstop9h 45mDelta
Wed 27/312:25 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 26/2C$ 884
Tue 12/35:15 p.m.SEA - LHR
Nonstop9h 25mDelta
Wed 27/312:25 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 26/2C$ 886
Tue 12/37:45 p.m.SEA - LHR
Nonstop9h 20mIberia
Mon 25/39:25 a.m.LHR - SEA
1 stop21h 04mIberia
Deal found 26/2C$ 930
Tue 12/36:55 p.m.SEA - LHR
Nonstop9h 45mDelta
Mon 25/312:25 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 26/2C$ 954
Tue 12/37:45 p.m.SEA - LHR
Nonstop9h 20mIberia
Tue 26/39:25 a.m.LHR - SEA
Nonstop10h 00mIberia
Deal found 26/2C$ 968
Sun 3/36:45 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Wed 13/32:50 p.m.LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 26/2C$ 970

One-way flights to London from Seattle

Search for one-way flight options from Seattle to London. 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 603,145 searches. Data last updated 27 February 2024.
Users in need of a one-way flight from Seattle to London can choose from these deals. Those seeking round-trip flights from Seattle to London should utilize the search form at the top of the page.
Wed 20/311:01 a.m.SEA - LGW
3 stops39h 59mMultiple Airlines
Deal found 26/2C$ 380
Wed 20/33:35 p.m.SEA - LGW
1 stop12h 20mIcelandair
Deal found 26/2C$ 545
Mon 12/83:50 p.m.SEA - LGW
1 stop11h 55mIcelandair
Deal found 26/2C$ 561
Mon 12/83:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Deal found 26/2C$ 561
Wed 3/47:19 a.m.SEA - LHR
2 stops20h 46mWestJet
Deal found 26/2C$ 570
Sun 12/57:00 a.m.SEA - LGW
2 stops42h 00mWestJet
Deal found 26/2C$ 586
Sat 30/37:19 a.m.SEA - LHR
2 stops44h 46mWestJet
Deal found 25/2C$ 591
Tue 26/32:35 p.m.SEA - LHR
Nonstop9h 25mFinnair
Deal found 26/2C$ 600
Tue 30/46:00 a.m.SEA - LGW
2 stops18h 10mMultiple Airlines
Deal found 26/2C$ 604

Find flights from Seattle to London within your budget

Customize your flight search to find flights from Seattle to London 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 603,145 searches. Data last updated 27 February 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 793 - C$ 874

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 24/4

1 stop20h 30m

London Heathrow

Sat 18/5

1 stop31h 10m

C$ 793

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 21/4

1 stop16h 10m

London Heathrow

Wed 15/5

2 stops15h 57m

C$ 830

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 21/4

1 stop14h 00m

London Heathrow

Tue 21/5

2 stops16h 57m

C$ 843

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 21/4

Nonstop9h 20m

London Heathrow

Thu 16/5

Nonstop9h 45m

C$ 845

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 27/3

1 stop13h 30m

London Heathrow

Fri 12/4

1 stop12h 17m

C$ 846

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 12/3

1 stop18h 00m

London Heathrow

Tue 26/3

1 stop16h 53m

C$ 849

Seattle/Tacoma IntlLondon Gatwick

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 21/4

1 stop14h 17m

London Gatwick

Thu 2/5

1 stop18h 24m

C$ 858

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 13/3

1 stop16h 03m

London Heathrow

Wed 27/3

1 stop19h 14m

C$ 863

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 30/4

1 stop14h 43m

London Heathrow

Thu 9/5

Nonstop9h 45m

C$ 874

Flights are sorted by cheapest first

Deals found on 26/2

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to London. Price data was last updated on 28 January 2024.
The price you pay for your flight from Seattle to London may vary depending on when you book. For the best chance of a lower fare, look to book 58 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Search Deals

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

Use this chart to determine the cheapest time to fly round-trip from Seattle to London. Price data was last updated on 25 February 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to London flight should consider departing on Wednesday evenings when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to London by month

Plan your trip from Seattle to London by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to London is currently C$ 555 while a round-trip flight costs C$ 845. Price data was last updated on 25 February 2024.

Currently, January is the cheapest month in which you can book a flight from Seattle to London (average of C$ 560). Flying from Seattle to London in July is currently the most expensive (average of C$ 964). 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$ 757

February

C$ 828

March

C$ 943

April

C$ 988

May

C$ 1,039

June

C$ 1,116

July

C$ 1,303

August

C$ 1,108

September

C$ 977

October

C$ 907

November

C$ 891

December

C$ 974

Temperature and rainfall in London by month

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

LON

Temperature

4 - 17 °C

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 27 February 2024.
To help decide which airline to fly from Seattle to London, see what other customers have to say about Icelandair, Air Canada and British Airways. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
11,830 reviews

Food

7.5

Boarding

8.2

Comfort

7.9

Crew

8.6

Overall

8.1

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

8.1
Very good
11,830 reviews
8.1
Very good
11,830 reviews

Food

7.5

Boarding

8.2

Comfort

7.9

Crew

8.6

Overall

8.1

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.8
Good
1,761 reviews
8.1
Very good
11,830 reviews

Food

7.5

Boarding

8.2

Comfort

7.9

Crew

8.6

Overall

8.1

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.8
Good
2,254 reviews
8.1
Very good
11,830 reviews

Food

7.5

Boarding

8.2

Comfort

7.9

Crew

8.6

Overall

8.1

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.7
Good
5,196 reviews
8.1
Very good
11,830 reviews

Food

7.5

Boarding

8.2

Comfort

7.9

Crew

8.6

Overall

8.1

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.7
Good
1,377 reviews
8.1
Very good
11,830 reviews

Food

7.5

Boarding

8.2

Comfort

7.9

Crew

8.6

Overall

8.1

Entertainment

8.1

Reviews

1 / 10