$308+ Cheap flights from Seattle (SEA) to London (LON)
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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Oct 12 — Oct 191
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to London 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 Seattle/Tacoma Intl to London are usually found in January or February, booked 82 days in advance, depart on a Monday or Wednesday and return on a Monday
Cheap flight deals from Seattle to London
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Cheapest flights from Seattle to LondonExplore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 12, 2026.
Explore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 12, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/8. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:00 pm -
1 stop17h 20m
Tue 10/201:05 pm -
1 stop12h 50m
Deal found 9/8![Icelandair logo]()
$752
This Booking.com deal was found by Cheapflights users on 9/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/43:55 pm -
2 stops17h 05m
Fri 10/96:40 am -
2 stops15h 05m
Deal found 9/7![Scandinavian Airlines logo]()
$758
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Fri 11/62:35 pm -
3 stops34h 00m
Wed 11/257:30 pm -
2 stops29h 30m
Deal found 9/8![Multiple Airlines logo]()
$760
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Sun 10/1810:30 am -
1 stop17h 35m
Mon 11/28:35 pm -
1 stop28h 25m
Deal found 9/8![Multiple Airlines logo]()
$761
This oojo deal was found by Cheapflights users on 9/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/27:00 pm -
1 stop32h 55m
Tue 10/201:05 pm -
1 stop12h 50m
Deal found 9/8![Icelandair logo]()
$765
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Sun 10/183:40 pm -
1 stop16h 35m
Mon 11/28:05 am -
1 stop16h 55m
Deal found 9/8![Multiple Airlines logo]()
$769
This flugladen.de deal was found by Cheapflights users on 9/8. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/233:40 pm -
1 stop12h 15m
Fri 10/3012:15 pm -
1 stop12h 45m
Deal found 9/8![Icelandair logo]()
$769
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/125:50 am -
3 stops27h 15m
Sun 10/1810:00 pm -
2 stops22h 20m
Deal found 9/12![Multiple Airlines logo]()
$771
This KLM deal was found by Cheapflights users on 9/11. 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.
Mon 9/219:43 am -
1 stop13h 27m
Sat 12/128:55 am -
1 stop12h 55m
Deal found 9/11![Multiple Airlines logo]()
$771
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Mon 10/53:40 pm -
2 stops19h 10m
Fri 10/166:20 am -
2 stops22h 20m
Deal found 9/8![Multiple Airlines logo]()
$772
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:50 pm -
1 stop17h 35m
Mon 11/2310:25 am -
1 stop13h 30m
Deal found 9/12![Condor logo]()
$772
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.
Mon 10/1210:50 am -
2 stops17h 00m
Mon 10/198:40 am -
2 stops17h 52m
Deal found 9/12![Multiple Airlines logo]()
$772
Best flights from Seattle to LondonDiscover carefully curated flight deals from Seattle to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
Discover carefully curated flight deals from Seattle to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
This Scandinavian Airlines deal was found by Cheapflights users on 9/10. 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.
Sun 10/113:55 pm -
2 stops16h 30m
Wed 10/146:40 am -
2 stops21h 24m
Deal found 9/10![Scandinavian Airlines logo]()
$776
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 10/255:45 pm -
Nonstop9h 55m
Sun 11/112:20 pm -
Nonstop10h 30m
Deal found 9/12![Delta logo]()
$781
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 10/257:40 pm -
Nonstop9h 40m
Sat 10/312:45 pm -
Nonstop10h 20m
Deal found 9/12![Alaska Airlines logo]()
$781
This Virgin Atlantic 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/273:25 pm -
1 stop18h 55m
Tue 11/39:20 am -
2 stops20h 45m
Deal found 9/12![Virgin Atlantic logo]()
$786
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.
Sun 9/2011:42 pm -
2 stops29h 03m
Tue 10/69:40 am -
1 stop15h 30m
Deal found 9/12![Multiple Airlines logo]()
$787
This SWISS deal was found by Cheapflights users on 9/10. 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.
Wed 10/77:00 am -
2 stops17h 25m
Wed 10/149:25 am -
2 stops17h 07m
Deal found 9/10![SWISS logo]()
$865
This Turkish Airlines deal was found by Cheapflights users on 9/8. 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.
Wed 11/117:05 pm -
1 stop19h 30m
Wed 11/1810:05 am -
1 stop39h 05m
Deal found 9/8![Turkish Airlines logo]()
$888
This Icelandair deal was found by Cheapflights users on 9/10. 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 12/162:35 pm -
1 stop12h 20m
Sun 12/2011:55 am -
1 stop13h 05m
Deal found 9/10![Icelandair logo]()
$1,133
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.
Mon 10/129:42 am -
1 stop16h 18m
Sun 10/186:30 pm -
Nonstop10h 25m
Deal found 9/12![Delta logo]()
$786
This Scandinavian 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/23:55 pm -
1 stop16h 05m
Sat 10/246:40 am -
2 stops25h 12m
Deal found 9/12![Scandinavian Airlines logo]()
$808
This Virgin Atlantic deal was found by Cheapflights users on 9/9. 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.
Wed 2/2411:25 am -
2 stops20h 20m
Sun 3/710:00 am -
2 stops20h 20m
Deal found 9/9![Virgin Atlantic logo]()
$817
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.
Sat 10/247:40 pm -
Nonstop9h 40m
Sat 10/312:45 pm -
Nonstop10h 20m
Deal found 9/12![Alaska Airlines logo]()
$831
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/42:35 pm -
1 stop14h 25m
Sat 11/147:00 am -
1 stop18h 00m
Deal found 9/9![Multiple Airlines logo]()
$840
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.
Thu 10/295:45 pm -
Nonstop9h 55m
Sat 11/76:30 am -
1 stop13h 17m
Deal found 9/12![Delta logo]()
$824
This Virgin Atlantic 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/12:20 pm -
1 stop21h 15m
Sun 2/148:05 pm -
1 stop23h 42m
Deal found 9/12![Virgin Atlantic logo]()
$835
This Turkish Airlines deal was found by Cheapflights users on 9/9. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/58:05 pm -
1 stop29h 50m
Fri 11/1310:55 am -
1 stop38h 15m
Deal found 9/9![Turkish Airlines logo]()
$930
This Mytrip deal was found by Cheapflights users on 9/11. 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.
Fri 10/93:40 pm -
2 stops18h 25m
Fri 10/165:40 am -
2 stops23h 00m
Deal found 9/11![Multiple Airlines logo]()
$847
This Scandinavian Airlines deal was found by Cheapflights users on 9/9. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1111:00 am -
2 stops22h 40m
Wed 11/186:40 am -
2 stops24h 46m
Deal found 9/9![Scandinavian Airlines logo]()
$875
This SWISS deal was found by Cheapflights users on 9/10. 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 10/57:00 am -
2 stops21h 35m
Fri 10/239:15 am -
2 stops21h 41m
Deal found 9/10![SWISS logo]()
$971
This Delta deal was found by Cheapflights users on 9/10. 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.
Tue 12/158:25 am -
1 stop14h 40m
Wed 12/2311:45 am -
2 stops20h 13m
Deal found 9/10![Delta logo]()
$824
This Virgin Atlantic deal was found by Cheapflights users on 9/9. 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.
Wed 2/246:00 am -
2 stops17h 15m
Sun 3/71:45 pm -
1 stop29h 50m
Deal found 9/9![Virgin Atlantic logo]()
$839
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/243:40 pm -
2 stops17h 55m
Sun 11/17:30 am -
1 stop17h 30m
Deal found 9/12![Multiple Airlines logo]()
$848
This Turkish 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/17:05 pm -
1 stop30h 50m
Sun 2/145:20 pm -
1 stop31h 50m
Deal found 9/12![Turkish Airlines logo]()
$940
This Scandinavian Airlines deal was found by Cheapflights users on 9/8. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/52:30 pm -
2 stops20h 00m
Tue 11/107:30 pm -
2 stops32h 43m
Deal found 9/8![Scandinavian Airlines logo]()
$905
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.
Sat 10/245:45 pm -
Nonstop9h 55m
Sun 11/112:20 pm -
Nonstop10h 30m
Deal found 9/12![Delta logo]()
$831
This SWISS deal was found by Cheapflights users on 9/8. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/291:19 pm -
2 stops20h 06m
Tue 10/67:15 pm -
2 stops31h 17m
Deal found 9/8![SWISS logo]()
$1,036
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/42:35 pm -
1 stop14h 25m
Mon 11/98:00 am -
1 stop17h 00m
Deal found 9/7![Multiple Airlines logo]()
$859
This Virgin Atlantic 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/226:00 am -
2 stops19h 00m
Fri 2/2610:00 am -
1 stop13h 03m
Deal found 9/12![Virgin Atlantic logo]()
$877
This Turkish Airlines deal was found by Cheapflights users on 9/8. 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.
Wed 11/111:16 pm -
2 stops43h 04m
Wed 11/1810:55 am -
1 stop38h 15m
Deal found 9/8![Turkish Airlines logo]()
$1,055
This Mytrip deal was found by Cheapflights users on 9/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/32:35 pm -
2 stops16h 00m
Sun 1/103:55 pm -
2 stops33h 05m
Deal found 9/10![Multiple Airlines logo]()
$880
Last-minute flights from Seattle to LondonDiscover last-minute flight deals from Seattle to London. Data last updated September 12, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to London. Data last updated September 12, 2026 and is based on user searches.
This KLM deal was found by Cheapflights users on 9/11. 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.
Mon 9/219:43 am -
1 stop13h 27m
Sat 12/128:55 am -
1 stop12h 55m
Deal found 9/11![Multiple Airlines logo]()
$771
This United Airlines deal was found by Cheapflights users on 9/11. 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 9/2211:03 am -
1 stop14h 37m
Sat 10/106:55 am -
1 stop18h 04m
Deal found 9/11![United Airlines logo]()
$773
This oojo deal was found by Cheapflights users on 9/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/27:00 pm -
1 stop32h 55m
Tue 10/201:05 pm -
1 stop12h 50m
Deal found 9/8![Icelandair logo]()
$765
This Booking.com deal was found by Cheapflights users on 9/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/43:55 pm -
2 stops17h 05m
Fri 10/96:40 am -
2 stops15h 05m
Deal found 9/7![Scandinavian Airlines logo]()
$758
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Mon 10/53:40 pm -
2 stops19h 10m
Fri 10/166:20 am -
2 stops22h 20m
Deal found 9/8![Multiple Airlines logo]()
$772
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/125:50 am -
3 stops27h 15m
Sun 10/1810:00 pm -
2 stops22h 20m
Deal found 9/12![Multiple Airlines logo]()
$771
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.
Mon 10/1210:50 am -
2 stops17h 00m
Mon 10/198:40 am -
2 stops17h 52m
Deal found 9/12![Multiple Airlines logo]()
$772
This Cheapflightsfares deal was found by Cheapflights users on 9/8. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:00 pm -
1 stop17h 20m
Tue 10/201:05 pm -
1 stop12h 50m
Deal found 9/8![Icelandair logo]()
$752
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/173:40 pm -
1 stop13h 25m
Sat 11/147:00 am -
1 stop18h 00m
Deal found 9/11![Multiple Airlines logo]()
$772
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Sun 10/1810:30 am -
1 stop17h 35m
Mon 11/28:35 pm -
1 stop28h 25m
Deal found 9/8![Multiple Airlines logo]()
$761
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Sun 10/183:40 pm -
1 stop16h 35m
Mon 11/28:05 am -
1 stop16h 55m
Deal found 9/8![Multiple Airlines logo]()
$769
This flugladen.de deal was found by Cheapflights users on 9/8. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/233:40 pm -
1 stop12h 15m
Fri 10/3012:15 pm -
1 stop12h 45m
Deal found 9/8![Icelandair logo]()
$769
One-way flights from Seattle to LondonSearch for one-way flight options from Seattle to London. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
Search for one-way flight options from Seattle to London. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
This Flightnetwork deal was found by Cheapflights users on 9/8. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/233:40 pm -
1 stop12h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Icelandair logo]()
$308
This Mytrip deal was found by Cheapflights users on 9/7. 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.
Sun 10/113:55 pm -
2 stops21h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Scandinavian Airlines logo]()
$316
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.
Wed 9/303:40 pm -
3 stops23h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Multiple Airlines logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/93:55 pm -
2 stops34h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/93:55 pm -
2 stops33h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Scandinavian Airlines logo]()
$320
This lol.travel deal was found by Cheapflights users on 9/8. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:40 pm -
1 stop15h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![JetBlue logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:00 pm -
2 stops41h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$325
This British Airways deal was found by Cheapflights users on 9/8. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/81:30 pm -
Nonstop9h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![British Airways logo]()
$325
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Wed 10/283:35 pm -
3 stops21h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Multiple Airlines logo]()
$326
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Tue 10/67:00 pm -
3 stops37h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Multiple Airlines logo]()
$326
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/203:55 pm -
3 stops57h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Multiple Airlines logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Tue 10/137:00 pm -
2 stops15h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Multiple Airlines logo]()
$328
Find flight deals from Seattle to London
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $669 (Cheapflightsfares) |
One-way from | $308 (Flightnetwork) |
Popular in | June |
Cheapest in | January |
Average price | $908 |
Good round-trip deal | $947 or less |
Good one-way deal | $433 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 12, 2026.
Use the filters below to find and compare flights from Seattle to London that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Mon 12/28
11:44 pm-6:40 am
2 stops22h 56m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$329
SeattleLondon
SEA Seattle/Tacoma Intl - LGW London Gatwick
SEALGW
Seattle/Tacoma Intl
Sun 2/28
7:15 am-3:45 pm
2 stops24h 30m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$334
SeattleLondon
SEA Seattle/Tacoma Intl - LCY London City
SEALCY
Seattle/Tacoma Intl
Wed 3/3
2:35 pm-7:15 am
1 stop32h 40m
London City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$342
SeattleLondon
SEA Seattle/Tacoma Intl - LCY London City
SEALCY
Seattle/Tacoma Intl
Mon 2/1
1:16 pm-5:05 pm
2 stops19h 49m
London City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$346
SeattleLondon
SEA Seattle/Tacoma Intl - LTN London Luton
SEALTN
Seattle/Tacoma Intl
Fri 10/2
10:30 am-5:20 pm
3 stops22h 50m
London Luton
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$350
Quickest round-trip
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Mon 12/28
6:45 pm-12:10 pm
Nonstop9h 25m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$356
SeattleLondon
SEA Seattle/Tacoma Intl - SEN London Southend
SEASEN
Seattle/Tacoma Intl
Wed 10/28
3:35 pm-7:40 am
3 stops33h 05m
London Southend
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$366
SeattleLondon
SEA Seattle/Tacoma Intl - LTN London Luton
SEALTN
Seattle/Tacoma Intl
Sun 11/29
2:35 pm-8:00 pm
3 stops21h 25m
London Luton
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$368
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Tue 11/10
4:50 pm-10:40 am
Nonstop9h 50m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$374
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Wed 11/11
6:55 pm-12:20 pm
Nonstop9h 25m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$374
Showing 1-10 of 60 resultsSorted by cheapest first
Compare providers for flights from Seattle to London
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 Seattle to London in September.
| 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*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Seattle-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-London flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Seattle-London 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 Seattle-London 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 Seattle to London
Have a flexible travel schedule? Discover the best time to fly to London from Seattle with our price prediction graph.
SEA-LON
SEA-LHR
SEA-LCY
SEA-LTN
SEA-LGW
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 Seattle to London
SEA-LON
SEA-LHR
SEA-LCY
SEA-LTN
SEA-LGW
What is the cheapest month to book a flight from Seattle to London?
Currently, January is the cheapest month in which you can book a flight from Seattle to London (average of $656). Flying from Seattle to London in June is currently the most expensive (average of $1,214). 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 SEA to LON?
Find hourly flight availability from Seattle to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 12, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to London as you normally would.
Weekly flight availability from Seattle to London
Explore weekly flight availability from Seattle to London. 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 September 12, 2026.
The most flights from SEA to LON are scheduled on a Tuesday (25 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 on average).
How much does it cost to fly round-trip from Seattle to London?
Airfare is below average for this route at the moment.
Seattle to London flights typically cost between $727 and $1,026 in February.The cheapest round-trip price found within the last 5 days was $669 on Icelandair (Feb 26-Mar 7).
What’s the top layover airport for flights from Seattle to London?
Share of 1-stop round-trip flights from Seattle to London chosen by Cheapflights users in the past 12 months, using the same layover each way.
Reykjavik (KEF) – chosen by Cheapflights users on 78% of 1-stop itineraries from Seattle to London on Cheapflights.
What’s the cheapest layover airport for flights from Seattle to London?
Average round-trip fare for 1-stop flights from Seattle to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $537.
What’s the fastest layover option from Seattle to London?
Shortest average travel time for 1-stop one-way flights from Seattle to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Reykjavik (KEF) have the shortest average one-way travel time for 1-stop routes: 12h 22m.
Which airport typically offers the quickest layover for flights from Seattle to London?
Average layover duration for 1-stop one-way flights from Seattle to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Frankfurt am Main (FRA) offer the fastest connection on this route, with an average layover time of 1h 13m.
How often are flights from Seattle to London delayed?
About 13% of weekly flights between Seattle and London have experienced delays in the past year, with the average delay time being 131 minutes.
What is the most punctual flight time for Seattle to London flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Seattle to London flights?
Over the last year, Virgin Atlantic 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 Seattle to London?
Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
The best insider tips for Seattle to London 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 Seattle to London trip
Our travel experts
Reviews of airlines servicing London
Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated September 12, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andVirgin Atlantic from Seattle to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Comfort
7.8
Entertainment
7.0
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Comfort
7.8
Entertainment
7.0
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Comfort
7.8
Entertainment
7.0
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Comfort
7.8
Entertainment
7.0
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Comfort
7.8
Entertainment
7.0
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Comfort
7.8
Entertainment
7.0
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Related info for your journey
Find useful and relevant information for your journey from Seattle to London. 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 London?
Book flights to London if you plan to visit one of these locationsIlford
Dorking
Gatwick
Hounslow
Harrow
Wembley
Southend-on-Sea
Basingstoke
Watford
Dartford
Winchester
Croydon
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
Harlow
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Top 10 airlines flying from Seattle to London
Discover the top 10 airlines that operate flights from Seattle to London. 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 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$480 | Average$758 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$506 | Average$710 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$542 | Average$694 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$549 | Average$979 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$559 | Average$954 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$564 | Average$880 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$569 | Average$910 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$569 | Average$833 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$635 | Average$981 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$639 | Average$866 | FlexibilityNo cancel fee | On-time77% |