$517+ Cheap flights from London (LON) to Seattle (SEA)
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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
Sep 10 — Sep 171
Round-trip
1 adult, Economy
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Find cheap flights from London 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 to Seattle/Tacoma Intl are usually found in February or January, booked 83 days in advance, depart on a Monday or Tuesday and return on a Wednesday
Cheap flight deals from London to Seattle
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Cheapest flights from London to SeattleExplore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 11, 2026.
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 11, 2026.
This Ticket deal was found by Cheapflights users on 8/7. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:25 pm -
1 stop31h 15m
Mon 9/283:40 pm -
1 stop12h 15m
Deal found 8/7![Icelandair logo]()
$607
This deal was found by Cheapflights users on 8/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2012:00 pm -
1 stop19h 30m
Thu 12/317:11 am -
1 stop16h 14m
Deal found 8/7![United Airlines logo]()
$612
This Mytrip deal was found by Cheapflights users on 8/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:20 pm -
2 stops26h 40m
Wed 10/215:40 pm -
2 stops22h 30m
Deal found 8/7![Multiple Airlines logo]()
$620
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 11/412:15 pm -
1 stop12h 45m
Tue 11/178:18 am -
2 stops15h 47m
Deal found 8/8![Multiple Airlines logo]()
$620
This TravelUp deal was found by Cheapflights users on 8/10. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:25 pm -
1 stop28h 30m
Wed 10/283:35 pm -
1 stop12h 15m
Deal found 8/10![Icelandair logo]()
$622
This Mytrip deal was found by Cheapflights users on 8/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:50 pm -
2 stops26h 10m
Wed 10/215:40 pm -
2 stops19h 25m
Deal found 8/6![Multiple Airlines logo]()
$625
This Gotogate deal was found by Cheapflights users on 8/6. 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.
Wed 10/141:05 pm -
1 stop12h 50m
Wed 10/213:40 pm -
1 stop12h 15m
Deal found 8/6![Icelandair logo]()
$629
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Sat 8/291:05 pm -
2 stops31h 15m
Sun 8/305:26 pm -
1 stop29h 19m
Deal found 8/7![United Airlines logo]()
$630
This Mytrip deal was found by Cheapflights users on 8/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:00 pm -
2 stops35h 40m
Sun 10/187:00 pm -
2 stops17h 00m
Deal found 8/9![Multiple Airlines logo]()
$631
This Gotogate deal was found by Cheapflights users on 8/6. 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.
Wed 10/211:05 pm -
1 stop12h 50m
Thu 11/52:35 pm -
1 stop12h 15m
Deal found 8/6![Icelandair logo]()
$631
This Gotogate deal was found by Cheapflights users on 8/8. 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.
Wed 10/2812:15 pm -
1 stop12h 45m
Thu 11/52:35 pm -
1 stop12h 15m
Deal found 8/8![Icelandair logo]()
$632
This Kiwi.com deal was found by Cheapflights users on 8/6. 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.
Mon 11/912:15 pm -
1 stop12h 45m
Mon 1/118:21 am -
2 stops15h 44m
Deal found 8/6![Multiple Airlines logo]()
$633
Best flights from London to SeattleDiscover carefully curated flight deals from London to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 11, 2026.
Discover carefully curated flight deals from London to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 11, 2026.
This Icelandair deal was found by Cheapflights users on 8/10. 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.
Wed 9/21:05 pm -
1 stop12h 50m
Wed 9/167:00 pm -
1 stop17h 20m
Deal found 8/10![Icelandair logo]()
$689
This United Airlines deal was found by Cheapflights users on 8/9. 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.
Thu 10/86:55 am -
1 stop18h 04m
Tue 10/2010:42 am -
1 stop14h 18m
Deal found 8/9![United Airlines logo]()
$715
This SWISS deal was found by Cheapflights users on 8/10. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:00 am -
2 stops20h 52m
Wed 10/2110:42 am -
2 stops18h 18m
Deal found 8/10![SWISS logo]()
$715
This Delta deal was found by Cheapflights users on 8/10. 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 10/510:00 am -
1 stop14h 35m
Wed 10/211:45 pm -
1 stop11h 45m
Deal found 8/10![Delta logo]()
$745
This British Airways deal was found by Cheapflights users on 8/10. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:55 am -
1 stop15h 46m
Tue 9/158:20 pm -
Nonstop9h 25m
Deal found 8/10![British Airways logo]()
$753
This Virgin Atlantic deal was found by Cheapflights users on 8/6. 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.
Wed 10/149:20 am -
1 stop15h 15m
Wed 10/211:42 pm -
2 stops18h 58m
Deal found 8/6![Virgin Atlantic logo]()
$759
This Mytrip deal was found by Cheapflights users on 8/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/33:50 pm -
2 stops29h 55m
Sun 9/133:55 pm -
3 stops21h 45m
Deal found 8/8![Multiple Airlines logo]()
$795
This KLM deal was found by Cheapflights users on 8/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1710:00 am -
1 stop14h 35m
Mon 9/211:50 pm -
1 stop11h 40m
Deal found 8/10![KLM logo]()
$842
This Scandinavian Airlines deal was found by Cheapflights users on 8/10. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/59:05 pm -
2 stops24h 40m
Wed 10/2110:51 am -
2 stops21h 09m
Deal found 8/10![Scandinavian Airlines logo]()
$899
This Turkish Airlines deal was found by Cheapflights users on 8/8. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:35 pm -
2 stops37h 21m
Mon 11/307:05 pm -
1 stop30h 50m
Deal found 8/8![Turkish Airlines logo]()
$987
This SWISS deal was found by Cheapflights users on 8/10. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:00 am -
2 stops20h 52m
Sun 11/11:16 pm -
2 stops20h 34m
Deal found 8/10![SWISS logo]()
$715
This United Airlines deal was found by Cheapflights users on 8/6. 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.
Mon 9/1411:25 am -
2 stops20h 01m
Mon 9/2112:44 pm -
1 stop12h 56m
Deal found 8/6![United Airlines logo]()
$752
This Virgin Atlantic deal was found by Cheapflights users on 8/8. 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.
Wed 10/286:55 pm -
1 stop24h 52m
Thu 11/56:00 am -
2 stops18h 50m
Deal found 8/8![Virgin Atlantic logo]()
$767
This Delta deal was found by Cheapflights users on 8/6. 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 9/1110:25 am -
1 stop15h 23m
Sat 9/266:45 pm -
1 stop13h 15m
Deal found 8/6![Delta logo]()
$808
This Mytrip deal was found by Cheapflights users on 8/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:10 am -
2 stops20h 35m
Fri 10/210:30 am -
2 stops23h 35m
Deal found 8/6![Multiple Airlines logo]()
$831
This Icelandair deal was found by Cheapflights users on 8/9. 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.
Fri 10/163:40 pm -
1 stop13h 00m
Fri 10/303:35 pm -
1 stop12h 20m
Deal found 8/9![Icelandair logo]()
$842
This Virgin Atlantic deal was found by Cheapflights users on 8/9. 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.
Sun 11/810:00 am -
1 stop13h 14m
Tue 12/811:00 am -
2 stops20h 45m
Deal found 8/9![Virgin Atlantic logo]()
$768
This SWISS deal was found by Cheapflights users on 8/10. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/99:15 am -
2 stops19h 32m
Sun 11/1510:50 am -
2 stops42h 00m
Deal found 8/10![SWISS logo]()
$783
This KLM deal was found by Cheapflights users on 8/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2810:00 am -
1 stop14h 27m
Thu 9/101:50 pm -
1 stop11h 40m
Deal found 8/9![KLM logo]()
$879
This Delta deal was found by Cheapflights users on 8/6. 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 9/410:25 am -
1 stop15h 18m
Sat 9/191:30 pm -
1 stop11h 50m
Deal found 8/6![Delta logo]()
$808
This United Airlines deal was found by Cheapflights users on 8/8. 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 9/16:55 am -
2 stops18h 47m
Mon 9/71:22 pm -
1 stop13h 48m
Deal found 8/8![United Airlines logo]()
$815
This Mytrip deal was found by Cheapflights users on 8/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/245:30 pm -
2 stops30h 30m
Fri 10/26:00 pm -
2 stops21h 50m
Deal found 8/9![Multiple Airlines logo]()
$842
This Virgin Atlantic deal was found by Cheapflights users on 8/9. 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.
Sun 11/85:50 pm -
2 stops29h 35m
Tue 12/82:35 pm -
1 stop18h 45m
Deal found 8/9![Virgin Atlantic logo]()
$792
This KLM deal was found by Cheapflights users on 8/6. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/210:00 am -
1 stop14h 35m
Wed 9/161:50 pm -
1 stop11h 40m
Deal found 8/6![KLM logo]()
$888
This Turkish Airlines deal was found by Cheapflights users on 8/8. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:35 pm -
2 stops37h 21m
Mon 11/307:05 pm -
1 stop30h 05m
Deal found 8/8![Turkish Airlines logo]()
$1,002
This SWISS deal was found by Cheapflights users on 8/10. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/29:15 am -
2 stops21h 41m
Wed 10/71:19 pm -
2 stops20h 06m
Deal found 8/10![SWISS logo]()
$830
This Mytrip deal was found by Cheapflights users on 8/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:40 am -
2 stops19h 00m
Mon 9/73:40 pm -
2 stops16h 05m
Deal found 8/8![Multiple Airlines logo]()
$889
This Delta deal was found by Cheapflights users on 8/6. 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 8/245:45 pm -
Nonstop10h 18m
Tue 9/17:38 am -
1 stop17h 37m
Deal found 8/6![Delta logo]()
$902
This TAP AIR PORTUGAL deal was found by Cheapflights users on 8/8. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/68:15 am -
3 stops45h 56m
Sun 11/226:45 am -
2 stops26h 45m
Deal found 8/8![TAP AIR PORTUGAL logo]()
$2,204
This Virgin Atlantic deal was found by Cheapflights users on 8/10. 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.
Wed 9/309:20 am -
2 stops19h 01m
Wed 10/75:45 pm -
1 stop16h 45m
Deal found 8/10![Virgin Atlantic logo]()
$833
Last-minute flights from London to SeattleDiscover last-minute flight deals from London to Seattle. Data last updated August 11, 2026 and is based on user searches.
Discover last-minute flight deals from London to Seattle. Data last updated August 11, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Sat 8/291:05 pm -
2 stops31h 15m
Sun 8/305:26 pm -
1 stop29h 19m
Deal found 8/7![United Airlines logo]()
$630
This TravelUp deal was found by Cheapflights users on 8/7. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/301:00 pm -
1 stop30h 45m
Mon 9/73:40 pm -
1 stop15h 00m
Deal found 8/7![Icelandair logo]()
$634
This TravelUp deal was found by Cheapflights users on 8/7. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/309:25 pm -
1 stop22h 20m
Mon 9/73:40 pm -
1 stop12h 15m
Deal found 8/7![Icelandair logo]()
$634
This TravelUp deal was found by Cheapflights users on 8/7. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/319:25 pm -
1 stop22h 20m
Mon 9/77:00 pm -
1 stop17h 20m
Deal found 8/7![Icelandair logo]()
$640
This TravelUp deal was found by Cheapflights users on 8/7. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/13:40 pm -
1 stop13h 00m
Mon 9/77:00 pm -
1 stop11h 40m
Deal found 8/7![Icelandair logo]()
$639
This Gotogate deal was found by Cheapflights users on 8/9. 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.
Tue 9/19:25 pm -
1 stop31h 15m
Thu 9/103:40 pm -
1 stop20h 40m
Deal found 8/9![Icelandair logo]()
$648
This Gotogate deal was found by Cheapflights users on 8/7. 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.
Wed 9/23:40 pm -
1 stop13h 00m
Wed 9/307:00 pm -
1 stop11h 40m
Deal found 8/7![Icelandair logo]()
$640
This Gotogate deal was found by Cheapflights users on 8/7. 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.
Wed 9/21:05 pm -
1 stop15h 35m
Wed 9/303:40 pm -
1 stop20h 40m
Deal found 8/7![Icelandair logo]()
$641
This TravelUp deal was found by Cheapflights users on 8/10. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:40 pm -
1 stop28h 05m
Tue 9/157:00 pm -
1 stop11h 40m
Deal found 8/10![Icelandair logo]()
$649
This Ticket deal was found by Cheapflights users on 8/7. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:25 pm -
1 stop31h 15m
Mon 9/283:40 pm -
1 stop12h 15m
Deal found 8/7![Icelandair logo]()
$607
This TravelUp deal was found by Cheapflights users on 8/9. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/289:25 pm -
1 stop31h 15m
Tue 10/67:00 pm -
1 stop17h 20m
Deal found 8/9![Icelandair logo]()
$643
This Gotogate deal was found by Cheapflights users on 8/8. 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.
Tue 9/291:05 pm -
1 stop12h 50m
Mon 11/22:35 pm -
1 stop12h 15m
Deal found 8/8![Icelandair logo]()
$639
One-way flights from London to SeattleSearch for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated August 11, 2026.
Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated August 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 9/39:40 am -
2 stops19h 20m
Deal found 8/10![Multiple Airlines logo]()
$517
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 9/189:25 pm -
3 stops53h 11m
Deal found 8/10![Multiple Airlines logo]()
$517
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Fri 11/66:15 am -
2 stops26h 20m
Deal found 8/10![American Airlines logo]()
$517
This Kiwi.com deal was found by Cheapflights users on 8/10. 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.
Sat 9/192:25 pm -
2 stops51h 15m
Deal found 8/10![Multiple Airlines logo]()
$519
This SWISS deal was found by Cheapflights users on 8/10. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/29:15 am -
2 stops22h 03m
Deal found 8/10![SWISS logo]()
$520
This Kiwi.com deal was found by Cheapflights users on 8/10. 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.
Sun 9/209:00 am -
2 stops32h 40m
Deal found 8/10![Multiple Airlines logo]()
$520
This Kiwi.com deal was found by Cheapflights users on 8/10. 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.
Sun 9/202:00 pm -
2 stops51h 42m
Deal found 8/10![Multiple Airlines logo]()
$521
This Cheapflightsfares deal was found by Cheapflights users on 8/10. 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.
Sun 9/208:25 pm -
2 stops23h 30m
Deal found 8/10![Lufthansa logo]()
$521
This Kiwi.com deal was found by Cheapflights users on 8/10. 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.
Sat 9/1910:00 pm -
2 stops43h 40m
Deal found 8/10![Multiple Airlines logo]()
$522
This Alaska Airlines deal was found by Cheapflights users on 8/10. 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 10/15:00 pm -
Nonstop10h 00m
Deal found 8/10![Alaska Airlines logo]()
$522
This Thrive Travel deal was found by Cheapflights users on 8/10. 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 Thrive Travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/58:35 am -
2 stops35h 25m
Deal found 8/10![Multiple Airlines logo]()
$523
This Thrive Travel deal was found by Cheapflights users on 8/10. 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 Thrive Travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/512:05 pm -
2 stops31h 55m
Deal found 8/10![Multiple Airlines logo]()
$524
Find flight deals from London to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from London (LON) 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 August 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $607 (Ticket) |
One-way from | $517 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $836 |
Good round-trip deal | $926 or less |
Good one-way deal | $591 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from London 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 2,558,603 searches. Data last updated August 11, 2026.
Use the filters below to find and compare flights from London 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 9/2
1:05 pm-5:55 pm
1 stop12h 50m
Seattle/Tacoma Intl
Wed 9/16
7:00 pm-8:20 pm
1 stop17h 20m
$689
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 10/8
6:55 am-4:59 pm
1 stop18h 04m
Seattle/Tacoma Intl
Tue 10/20
10:42 am-9:00 am
1 stop14h 18m
$715
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 10/5
6:00 am-6:52 pm
2 stops20h 52m
Seattle/Tacoma Intl
Wed 10/21
10:42 am-1:00 pm
2 stops18h 18m
$715
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 10/23
6:00 am-6:52 pm
2 stops20h 52m
Seattle/Tacoma Intl
Sun 11/1
1:16 pm-5:50 pm
2 stops20h 34m
$715
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Mon 10/5
10:00 am-4:35 pm
1 stop14h 35m
Seattle/Tacoma Intl
Wed 10/21
1:45 pm-9:30 am
1 stop11h 45m
$745
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 9/14
11:25 am-11:26 pm
2 stops20h 01m
Seattle/Tacoma Intl
Mon 9/21
12:44 pm-9:40 am
1 stop12h 56m
$752
Quickest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 9/8
8:55 am-4:41 pm
1 stop15h 46m
Seattle/Tacoma Intl
Tue 9/15
8:20 pm-1:45 pm
Nonstop9h 25m
$753
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Wed 10/14
9:20 am-4:35 pm
1 stop15h 15m
Seattle/Tacoma Intl
Wed 10/21
1:42 pm-4:40 pm
2 stops18h 58m
$759
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Wed 10/28
6:55 pm-12:47 pm
1 stop24h 52m
Seattle/Tacoma Intl
Thu 11/5
6:00 am-8:50 am
2 stops18h 50m
$767
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Sun 11/8
10:00 am-3:14 pm
1 stop13h 14m
Seattle/Tacoma Intl
Tue 12/8
11:00 am-3:45 pm
2 stops20h 45m
$768
Showing 1-10 of 60 resultsSorted by cheapest first
Compare providers for flights from London 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 London to Seattle in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on London-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on London-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-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 London to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.
LON-SEA
LHR-SEA
LTN-SEA
LCY-SEA
LGW-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 to Seattle
LON-SEA
LHR-SEA
LTN-SEA
LCY-SEA
LGW-SEA
What is the cheapest month to book a flight from London to Seattle?
Currently, February is the cheapest month in which you can book a flight from London to Seattle (average of $650). Flying from London to Seattle in July is currently the most expensive (average of $862). 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 LON to SEA?
Find hourly flight availability from London 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 August 11, 2026.
When flying from London to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Weekly flight availability from London to Seattle
Explore weekly flight availability from London 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 August 11, 2026.
The most flights from LON to SEA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (23 on average).
How much does it cost to fly round-trip from London to Seattle?
Airfare is below average for this route at the moment.
London to Seattle flights typically cost between $714 and $946 in September.The cheapest round-trip price found within the last 5 days was $607 on Icelandair (Sep 21-Sep 28).
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 128 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?
Thursday 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.
How far ahead should I book a flight from London to Seattle?
To ensure you get the cheapest price possible for a flight from London to Seattle, you should look to book at least 80 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
The best insider tips for London 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 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 August 11, 2026.
See what other customers who have flown with Alaska Airlines,Delta, andVirgin Atlantic from London to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Entertainment
7.0
Comfort
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Food
7.0
Entertainment
7.0
Comfort
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Food
7.0
Entertainment
7.0
Comfort
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Food
7.0
Entertainment
7.0
Comfort
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Food
7.0
Entertainment
7.0
Comfort
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Food
7.0
Entertainment
7.0
Comfort
7.8
Boarding
8.1
Crew
8.5
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 London 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
Edmonds
Snoqualmie
Lynnwood
Tumwater
Centralia
Puyallup
Marysville
Kent
Ellensburg
Fife
Ocean Shores
Lakewood
Poulsbo
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London and Seattle flights
Browse other London and Seattle flight options. Last updated on August 11, 2026.
Other flights from London
Browse through other flights departing from London. Flights are based on user searches made on Cheapflights and were last updated on August 11, 2026.
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Other flights to Seattle
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Top 7 airlines flying from London to Seattle
Discover the top 7 airlines that operate flights from London 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 2,558,603 searches. Data last updated August 11, 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$536 | Average$1,012 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$618 | Average$985 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$661 | Average$903 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$670 | Average$914 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$768 | Average$865 | FlexibilityNo cancel fee | On-time75% |