$510+ Cheap flights from Heathrow (LHR) to Seattle (SEA)
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 2/17. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
Oct 17 — Oct 241
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Heathrow to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 Monday or Sunday and return on a Monday
Cheap flight deals from Heathrow to Seattle
Cheapest
Best
Last-minute
One-way
Cheapest flights from Heathrow to SeattleExplore 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 September 17, 2026.
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 September 17, 2026.
This Gotogate deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2710:15 am -
2 stops16h 17m
Tue 10/135:50 am -
2 stops16h 40m
Deal found 9/16![Air Canada logo]()
$573
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/159:30 am -
1 stop34h 30m
Thu 1/710:54 am -
2 stops16h 26m
Deal found 9/16![United Airlines logo]()
$575
This Justfly.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:00 am -
2 stops22h 59m
Thu 12/107:45 am -
2 stops17h 35m
Deal found 9/16![Air Canada logo]()
$577
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/3112:20 pm -
Nonstop10h 34m
Sat 12/59:40 am -
1 stop14h 05m
Deal found 9/16![Delta logo]()
$578
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:45 pm -
Nonstop10h 29m
Thu 11/54:50 pm -
Nonstop9h 50m
Deal found 9/16![Delta logo]()
$579
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/112:20 pm -
Nonstop10h 30m
Sat 12/59:40 am -
1 stop14h 05m
Deal found 9/16![Delta logo]()
$580
This Alaska Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/172:45 pm -
Nonstop10h 05m
Tue 1/56:50 pm -
Nonstop9h 30m
Deal found 9/14![Alaska Airlines logo]()
$581
This Air Canada deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/11:25 pm -
2 stops16h 32m
Wed 11/1810:10 am -
1 stop17h 40m
Deal found 9/15![Air Canada logo]()
$582
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/235:35 pm -
1 stop28h 20m
Sun 1/104:55 pm -
Nonstop9h 45m
Deal found 9/14![Delta logo]()
$583
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1112:20 pm -
Nonstop10h 30m
Fri 1/88:25 am -
1 stop14h 40m
Deal found 9/16![Delta logo]()
$584
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1210:45 am -
1 stop20h 08m
Sun 1/314:55 pm -
Nonstop9h 45m
Deal found 9/16![Delta logo]()
$585
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/212:20 pm -
Nonstop10h 30m
Sat 11/141:30 pm -
1 stop12h 30m
Deal found 9/15![Delta logo]()
$586
Best flights from Heathrow to SeattleDiscover 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 September 17, 2026.
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 September 17, 2026.
This Virgin Atlantic deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2611:40 am -
Nonstop10h 20m
Fri 10/29:50 pm -
Nonstop9h 45m
Deal found 9/16![Virgin Atlantic logo]()
$580
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:05 pm -
1 stop22h 15m
Mon 10/129:50 pm -
Nonstop9h 45m
Deal found 9/14![Delta logo]()
$585
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/186:35 am -
1 stop14h 25m
Tue 1/510:45 pm -
1 stop13h 50m
Deal found 9/15![United Airlines logo]()
$714
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/279:25 pm -
1 stop28h 30m
Fri 10/23:40 pm -
1 stop20h 40m
Deal found 9/16![Icelandair logo]()
$874
This Alaska Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/202:45 pm -
Nonstop10h 05m
Mon 1/46:55 pm -
Nonstop9h 25m
Deal found 9/12![Alaska Airlines logo]()
$901
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/912:20 pm -
Nonstop10h 25m
Fri 3/125:00 pm -
Nonstop9h 40m
Deal found 9/16![Delta logo]()
$588
This Virgin Atlantic deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/246:20 am -
1 stop15h 35m
Fri 1/14:55 pm -
Nonstop9h 45m
Deal found 9/13![Virgin Atlantic logo]()
$663
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/297:40 am -
1 stop16h 39m
Fri 1/111:44 pm -
2 stops22h 56m
Deal found 9/15![United Airlines logo]()
$799
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1812:20 pm -
Nonstop10h 30m
Tue 1/51:45 pm -
1 stop33h 20m
Deal found 9/15![Delta logo]()
$765
This Icelandair deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2612:15 pm -
1 stop12h 45m
Tue 12/811:29 am -
2 stops15h 21m
Deal found 9/13![Icelandair logo]()
$890
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2312:20 pm -
Nonstop10h 30m
Fri 1/14:55 pm -
Nonstop9h 45m
Deal found 9/13![Delta logo]()
$769
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/188:55 am -
1 stop14h 18m
Sat 1/94:55 pm -
Nonstop9h 45m
Deal found 9/16![Delta logo]()
$805
Last-minute flights from Heathrow to SeattleDiscover last-minute flight deals from Heathrow to Seattle. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Heathrow to Seattle. Data last updated September 17, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2310:15 am -
2 stops16h 17m
Sat 10/35:50 am -
2 stops16h 40m
Deal found 9/16![Air Canada logo]()
$583
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:45 pm -
Nonstop10h 25m
Sat 10/32:56 pm -
1 stop14h 09m
Deal found 9/15![Delta logo]()
$586
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/245:45 pm -
Nonstop10h 25m
Sat 10/35:30 pm -
Nonstop9h 50m
Deal found 9/16![Delta logo]()
$580
This Air Canada deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/253:05 pm -
1 stop31h 12m
Thu 10/13:00 pm -
2 stops31h 30m
Deal found 9/15![Air Canada logo]()
$585
This Air Canada deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:05 pm -
2 stops16h 42m
Thu 10/2210:50 am -
1 stop18h 30m
Deal found 9/12![Air Canada logo]()
$584
This Gotogate deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2710:15 am -
2 stops16h 17m
Tue 10/135:50 am -
2 stops16h 40m
Deal found 9/16![Air Canada logo]()
$573
This Air Canada deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/292:05 pm -
2 stops16h 42m
Wed 10/75:50 am -
2 stops16h 40m
Deal found 9/14![Air Canada logo]()
$588
This Air Canada deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:15 am -
2 stops31h 50m
Sat 10/173:00 pm -
1 stop14h 20m
Deal found 9/14![Air Canada logo]()
$582
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/195:45 pm -
Nonstop10h 29m
Fri 11/1311:45 am -
1 stop14h 10m
Deal found 9/14![Delta logo]()
$581
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:45 pm -
Nonstop10h 29m
Thu 11/54:50 pm -
Nonstop9h 50m
Deal found 9/16![Delta logo]()
$579
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2510:00 am -
1 stop19h 53m
Sun 11/88:30 am -
1 stop17h 10m
Deal found 9/14![United Airlines logo]()
$587
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/3112:20 pm -
Nonstop10h 34m
Sat 12/59:40 am -
1 stop14h 05m
Deal found 9/16![Delta logo]()
$578
One-way flights from Heathrow to SeattleSearch for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/176:35 am -
1 stop14h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Lufthansa logo]()
$510
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:30 am -
2 stops22h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Delta logo]()
$511
This Delta deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/276:30 am -
2 stops22h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Delta logo]()
$512
This Booking.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/242:55 pm -
Nonstop9h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Finnair logo]()
$513
This Kiwi.com deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/82:10 pm -
1 stop12h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![WestJet logo]()
$514
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/79:25 pm -
1 stop28h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Icelandair logo]()
$515
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/106:30 am -
2 stops21h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Delta logo]()
$516
This Justfly.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/252:55 pm -
Nonstop9h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Iberia logo]()
$517
This Iberia deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:15 am -
2 stops22h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Iberia logo]()
$518
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/237:25 am -
1 stop17h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Lufthansa logo]()
$519
This American Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/136:10 am -
2 stops26h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![American Airlines logo]()
$520
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/116:30 am -
2 stops18h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Delta logo]()
$521
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 September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $573 (Gotogate) |
One-way from | $510 (Cheapflightsfares) |
Popular in | July |
Cheapest in | January |
Average price | $782 |
Good round-trip deal | $602 or less |
Good one-way deal | $528 or less |
Cheapflights Fare Finder
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 September 17, 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
Cheapest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 3/10
6:30 am-7:47 pm
2 stops21h 17m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$516
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 3/9
9:00 am-8:48 pm
2 stops19h 48m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$518
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sat 3/13
8:40 am-8:45 am
2 stops32h 05m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$522
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 12/15
12:20 pm-2:50 pm
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$522
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sun 3/14
6:30 am-5:43 am
2 stops31h 13m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$522
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 2/24
7:30 am-11:21 pm
3 stops23h 51m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$523
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 12/11
12:20 pm-2:50 pm
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$523
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 12/14
12:20 pm-2:50 pm
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$523
Quickest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 2/4
2:45 pm-4:40 pm
Nonstop9h 55m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$524
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 12/10
12:20 pm-2:50 pm
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$524
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Heathrow to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Seattle in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on London Heathrow Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on London Heathrow Airport-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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 best time to book flights from London Heathrow Airport to Seattle is 56 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.
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 $675). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $894). 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 September 17, 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 often are flights from London to Seattle delayed?
About 11% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 130 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 Tuesday 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 last year, Delta have had the lowest number of delays on this route, with just 5% of flights being delayed.
The best insider tips for London Heathrow Airport to Seattle flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Seattle trip
Our travel experts
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated September 17, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andVirgin Atlantic from London Heathrow Airport to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
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.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Olympia
Tukwila
Snoqualmie
Puyallup
Lynnwood
Centralia
Kent
Tumwater
Ellensburg
Issaquah
Marysville
Ocean Shores
Lakewood
Fife
Poulsbo
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Heathrow
Popular flights
Seattle flight routes
Alternative routes for Heathrow to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Heathrow to Seattle by cabin class
Find flights from Heathrow to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Heathrow and Seattle flights
Browse other Heathrow and Seattle flight options. Last updated on September 17, 2026.
Other flights from Heathrow
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Top 7 airlines flying from Heathrow to Seattle
Discover the top 7 airlines that operate flights from Heathrow to Seattle. 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 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$485 | Average$796 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$534 | Average$810 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$581 | Average$840 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$584 | Average$1,009 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$618 | Average$1,036 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$670 | Average$914 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$714 | Average$911 | FlexibilityNo cancel fee | On-time70% |