Cheap flights from London Heathrow Airport to Seattle from C$ 737
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
31 Oct — 7 Nov1
Round-trip
1 adult
Economy
Round-trip
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in January or February, booked 57 days in advance, depart on a Tuesday or Thursday and return on a Sunday
Cheap flight deals from Heathrow to Seattle
Enter your travel dates to find the best prices.
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One-way
Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 October 2026.
Mon 5/106:30 a.m. -
1 stop18h 05m
Mon 19/109:50 p.m. -
Nonstop9h 45m
Deal found 28/9C$ 782
Fri 9/106:30 a.m. -
1 stop18h 05m
Mon 12/105:30 p.m. -
Nonstop9h 50m
Deal found 30/9C$ 784
Tue 8/126:30 a.m. -
1 stop13h 20m
Thu 14/14:55 p.m. -
Nonstop9h 45m
Deal found 30/9C$ 785
Sat 7/116:30 a.m. -
1 stop13h 17m
Mon 8/39:00 a.m. -
1 stop17h 00m
Deal found 28/9C$ 790
Fri 9/1011:45 a.m. -
1 stop12h 50m
Sun 18/106:00 a.m. -
1 stop17h 10m
Deal found 30/9C$ 791
Sun 13/126:30 a.m. -
2 stops22h 12m
Tue 19/14:55 p.m. -
Nonstop9h 45m
Deal found 30/9C$ 792
Mon 7/128:55 a.m. -
1 stop14h 18m
Sun 17/14:55 p.m. -
Nonstop9h 45m
Deal found 30/9C$ 794
Thu 10/128:55 a.m. -
1 stop12h 55m
Mon 18/14:55 p.m. -
Nonstop9h 45m
Deal found 30/9C$ 795
Mon 7/126:20 a.m. -
1 stop16h 53m
Fri 15/111:25 a.m. -
1 stop14h 35m
Deal found 30/9C$ 801
Tue 15/129:30 a.m. -
1 stop34h 30m
Tue 29/127:00 a.m. -
2 stops19h 50m
Deal found 28/9C$ 802
Fri 9/109:55 a.m. -
1 stop14h 40m
Wed 14/106:40 p.m. -
1 stop13h 55m
Deal found 30/9C$ 805
Wed 28/102:45 p.m. -
Nonstop10h 20m
Wed 4/116:45 p.m. -
Nonstop9h 35m
Deal found 28/9C$ 807
Best flights from Heathrow to Seattle
Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 1 October 2026.
Tue 8/126:30 a.m. -
1 stop13h 20m
Tue 19/14:55 p.m. -
Nonstop9h 45m
Deal found 30/9C$ 785
Fri 11/1211:35 a.m. -
2 stops20h 09m
Sun 13/127:00 a.m. -
2 stops15h 40m
Deal found 29/9C$ 819
Mon 9/118:35 p.m. -
1 stop28h 25m
Fri 12/32:35 p.m. -
1 stop20h 55m
Deal found 28/9C$ 834
Wed 16/1212:20 p.m. -
Nonstop10h 30m
Wed 6/12:25 p.m. -
1 stop12h 20m
Deal found 27/9C$ 1,037
Thu 10/126:00 a.m. -
2 stops24h 43m
Sat 16/13:30 p.m. -
2 stops18h 20m
Deal found 30/9C$ 1,059
Fri 11/126:30 a.m. -
2 stops16h 59m
Sun 13/127:38 a.m. -
1 stop15h 12m
Deal found 29/9C$ 794
Mon 7/126:20 a.m. -
1 stop16h 53m
Wed 20/19:55 p.m. -
1 stop14h 15m
Deal found 30/9C$ 801
Wed 2/129:30 a.m. -
2 stops19h 17m
Tue 15/125:05 a.m. -
2 stops19h 25m
Deal found 26/9C$ 967
Sun 11/106:30 p.m. -
Nonstop10h 25m
Sat 17/1010:59 p.m. -
1 stop23h 21m
Deal found 30/9C$ 809
Sun 13/1212:20 p.m. -
Nonstop10h 30m
Sun 17/17:15 a.m. -
1 stop15h 05m
Deal found 30/9C$ 817
Tue 30/35:35 p.m. -
1 stop25h 40m
Sat 10/411:05 p.m. -
1 stop24h 05m
Deal found 30/9C$ 1,018
Wed 23/1212:20 p.m. -
Nonstop10h 30m
Thu 31/126:00 a.m. -
1 stop17h 05m
Deal found 26/9C$ 1,071
Direct flights from Heathrow to Seattle
Explore direct flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 1 October 2026.
Sun 10/112:20 p.m. -
Nonstop10h 25m
Sat 23/14:55 p.m. -
Nonstop9h 45m
Deal found 29/9C$ 802
Wed 28/102:45 p.m. -
Nonstop10h 20m
Wed 4/116:45 p.m. -
Nonstop9h 35m
Deal found 28/9C$ 807
Thu 19/1112:20 p.m. -
Nonstop10h 30m
Tue 19/14:55 p.m. -
Nonstop9h 45m
Deal found 28/9C$ 808
Tue 24/112:45 p.m. -
Nonstop10h 15m
Wed 9/126:45 p.m. -
Nonstop9h 35m
Deal found 29/9C$ 809
Sat 12/122:45 p.m. -
Nonstop10h 15m
Sat 16/16:50 p.m. -
Nonstop9h 30m
Deal found 30/9C$ 811
Sat 21/112:45 p.m. -
Nonstop10h 15m
Mon 23/116:45 p.m. -
Nonstop9h 35m
Deal found 30/9C$ 812
Thu 12/112:55 p.m. -
Nonstop9h 55m
Thu 19/111:40 p.m. -
Nonstop9h 30m
Deal found 28/9C$ 814
Fri 5/22:45 p.m. -
Nonstop9h 55m
Thu 18/26:50 p.m. -
Nonstop9h 30m
Deal found 29/9C$ 817
Thu 14/12:45 p.m. -
Nonstop9h 55m
Mon 18/16:50 p.m. -
Nonstop9h 30m
Deal found 26/9C$ 818
Thu 7/112:20 p.m. -
Nonstop10h 25m
Thu 14/14:55 p.m. -
Nonstop9h 45m
Deal found 30/9C$ 829
Sat 28/119:25 a.m. -
Nonstop10h 00m
Fri 4/126:45 p.m. -
Nonstop9h 25m
Deal found 28/9C$ 842
Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 1 October 2026 and is based on user searches.
Mon 5/106:30 a.m. -
1 stop18h 05m
Mon 19/109:50 p.m. -
Nonstop9h 45m
Deal found 28/9C$ 782
Fri 9/108:40 a.m. -
1 stop15h 55m
Mon 19/107:55 p.m. -
2 stops16h 15m
Deal found 30/9C$ 784
Fri 9/1011:45 a.m. -
1 stop12h 50m
Sun 18/106:00 a.m. -
1 stop17h 10m
Deal found 30/9C$ 791
Fri 9/109:55 a.m. -
1 stop14h 40m
Wed 14/106:40 p.m. -
1 stop13h 55m
Deal found 30/9C$ 805
Thu 22/106:30 a.m. -
1 stop13h 22m
Thu 5/114:50 p.m. -
Nonstop9h 50m
Deal found 29/9C$ 785
Fri 23/105:45 p.m. -
Nonstop10h 29m
Mon 26/105:45 p.m. -
Nonstop9h 55m
Deal found 28/9C$ 811
Wed 28/102:45 p.m. -
Nonstop10h 20m
Wed 4/116:45 p.m. -
Nonstop9h 35m
Deal found 28/9C$ 807
Sat 7/116:30 a.m. -
1 stop13h 17m
Mon 8/39:00 a.m. -
1 stop17h 00m
Deal found 28/9C$ 790
Wed 18/116:20 a.m. -
1 stop16h 54m
Mon 18/14:55 p.m. -
Nonstop9h 45m
Deal found 28/9C$ 792
Thu 19/1112:20 p.m. -
Nonstop10h 30m
Tue 19/14:55 p.m. -
Nonstop9h 45m
Deal found 28/9C$ 808
Tue 24/116:20 a.m. -
1 stop15h 30m
Fri 22/14:55 p.m. -
Nonstop9h 45m
Deal found 28/9C$ 794
Tue 24/112:45 p.m. -
Nonstop10h 15m
Wed 9/126:45 p.m. -
Nonstop9h 35m
Deal found 29/9C$ 809
One-way flights from Heathrow to Seattle
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated 1 October 2026.
Mon 1/32:45 p.m. -
Nonstop9h 55m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 28/9C$ 737
Thu 26/119:50 a.m. -
1 stop15h 20m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 27/9C$ 738
Wed 24/312:20 p.m. -
Nonstop10h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 28/9C$ 750
Wed 6/112:20 p.m. -
Nonstop10h 25m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 27/9C$ 751
Wed 21/109:25 p.m. -
1 stop28h 30m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 29/9C$ 755
Sat 20/310:45 a.m. -
1 stop14h 45m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 28/9C$ 758
Mon 16/114:20 p.m. -
3 stops34h 57m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 30/9C$ 761
Tue 5/110:10 a.m. -
1 stop19h 52m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 27/9C$ 765
Wed 28/108:35 p.m. -
1 stop28h 25m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 27/9C$ 778
Sun 27/126:30 a.m. -
2 stops33h 48m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 29/9C$ 780
Tue 2/38:00 a.m. -
3 stops23h 34m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 28/9C$ 781
Tue 26/18:00 a.m. -
3 stops23h 31m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 1/10C$ 782
Find flight deals from Heathrow to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Seattle (SEA). 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 1 October 2026.
Customize your flight search to find flights from Heathrow to Seattle 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 7,457,451 searches. Data last updated 1 October 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 7/1
12:20 p.m.-2:45 p.m.
Nonstop10h 25m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-9:00 a.m.
Nonstop0h 00m
C$ 750
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sat 20/3
10:45 a.m.-6:30 p.m.
1 stop14h 45m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-9:00 a.m.
Nonstop0h 00m
C$ 758
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 8/12
6:30 a.m.-11:50 a.m.
1 stop13h 20m
Seattle/Tacoma Intl
Tue 19/1
4:55 p.m.-10:40 a.m.
Nonstop9h 45m
C$ 785
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 26/10
8:35 p.m.-6:00 p.m.
1 stop28h 25m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-9:00 a.m.
Nonstop0h 00m
C$ 792
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 22/10
8:40 a.m.-10:42 p.m.
1 stop22h 02m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-9:00 a.m.
Nonstop0h 00m
C$ 792
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 11/12
6:30 a.m.-3:29 p.m.
2 stops16h 59m
Seattle/Tacoma Intl
Sun 13/12
7:38 a.m.-6:50 a.m.
1 stop15h 12m
C$ 794
Quickest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 21/12
2:45 p.m.-4:50 p.m.
Nonstop10h 05m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-9:00 a.m.
Nonstop0h 00m
C$ 800
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sat 14/11
4:40 p.m.-1:00 p.m.
1 stop28h 20m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-9:00 a.m.
Nonstop0h 00m
C$ 801
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 7/12
6:20 a.m.-3:13 p.m.
1 stop16h 53m
Seattle/Tacoma Intl
Wed 20/1
9:55 p.m.-8:10 p.m.
1 stop14h 15m
C$ 801
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sat 28/11
4:40 p.m.-1:00 p.m.
1 stop28h 20m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-9:00 a.m.
Nonstop0h 00m
C$ 802
Flights are sorted by cheapest round-trip flights first.
Deals found on 30/9
Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Heathrow to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.
LHR-SEA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from London Heathrow Airport to Seattle
Prices
Airlines
Delays
How far ahead should I book a flight from London Heathrow Airport to Seattle?
The price you pay for your flight from London Heathrow Airport to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 56 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from London Heathrow Airport to Seattle?
Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of C$ 932). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of C$ 1,270). 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.
What is the cheapest time of day to fly from LHR to SEA?
Find hourly flight availability from Heathrow to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 1 October 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to Seattle as you normally would.
How much does it cost to fly round-trip from London Heathrow Airport to Seattle?
Airfare is below average for this route at the moment.
London Heathrow Airport to Seattle flights typically cost between C$ 890 and C$ 1,142 in February.The cheapest round-trip price found within the last 5 days was C$ 781 on Multiple Airlines (5 Feb-8 Feb).
Weekly flight availability from London Heathrow Airport to Seattle
Explore weekly flight availability from Heathrow to Seattle. 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 1 October 2026.
The most flights from LHR to SEA are scheduled on a Monday (24 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (17 on average).
How often are flights from London to Seattle delayed?
About 12% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 134 minutes.
What is the most punctual flight time for London to Seattle flights?
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Sunday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on London to Seattle flights?
Over the past year, Delta has had the lowest number of delays on this route, with just 5% of flights being delayed.
Related info for your journey
Find useful and relevant information for your journey from Heathrow to Seattle. 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 into for flights to Seattle from London Heathrow?
Seattle/Tacoma Intl (SEA), located 18.4 km from the city centre, is the airport you fly into when you book flights from London Heathrow to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from London Heathrow on a regular basis. Booking flights from London Heathrow to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 20 inbound flights from London Heathrow per day.
How long is the flight from London Heathrow Airport to Seattle?
A quick flight from London Heathrow Airport to Seattle can take about 10h 30m. Delta provides one of the quickest options available for as low as C$ 808. There are 7697 km between London Heathrow Airport and Seattle. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the most reliable airlines from London Heathrow Airport to Seattle?
Consider Scandinavian Airlines (82%), KLM (81%) or SAUDIA (81%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.
Can I find deals for flights from Heathrow to Seattle that include hotel bookings?
Yes. In addition to deals on Heathrow to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Heathrow to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Seattle.
Can I find deals for business class flights from Heathrow to Seattle?
Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London Heathrow Airport to Seattle?
Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of C$ 932). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of C$ 1,270). 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.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 1 October 2026.
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 Heathrow to Seattle?
Deals for Heathrow to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Heathrow to Seattle?
Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Heathrow to Seattle for you. Better yet — we are completely free to use.
Can Cheapflights find flights from Heathrow to Seattle with no change fees?
Yes, we can. To see specific flights from Heathrow to Seattle with no change fees, users can toggle flexible booking options after using the search form above to find flights.
Can Cheapflights notify me if prices for flights from Heathrow to Seattle become cheaper?
Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Heathrow today and book when prices fit your budget.
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