$335+ 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Oct 27 — Nov 31
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 April, 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 27, 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 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 11/302:35 pm -
1 stop16h 55m
Mon 12/1411:40 am -
1 stop13h 20m
Deal found 9/24![Multiple Airlines logo]()
$771
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 11/292:35 pm -
1 stop12h 15m
Mon 12/712:15 pm -
1 stop12h 45m
Deal found 9/24![Icelandair logo]()
$771
This Mytrip deal was found by Cheapflights users on 9/27. 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 11/51:50 pm -
2 stops23h 55m
Thu 11/127:30 pm -
2 stops25h 30m
Deal found 9/27![Multiple Airlines logo]()
$772
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 11/262:35 pm -
1 stop20h 55m
Tue 12/112:15 pm -
1 stop12h 45m
Deal found 9/25![Icelandair logo]()
$772
This Air Canada deal was found by Cheapflights users on 9/25. 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 11/810:10 am -
1 stop17h 40m
Tue 11/106:35 am -
2 stops19h 47m
Deal found 9/25![Multiple Airlines logo]()
$773
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 10/127:00 pm -
1 stop11h 40m
Tue 10/203:40 pm -
1 stop13h 00m
Deal found 9/23![Icelandair logo]()
$774
This Justfly.com deal was found by Cheapflights users on 9/23. 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.
Thu 11/191:40 pm -
Nonstop9h 30m
Tue 11/242:55 pm -
Nonstop9h 55m
Deal found 9/23![Iberia logo]()
$774
This Mytrip deal was found by Cheapflights users on 9/23. 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 10/237:00 pm -
2 stops18h 10m
Sat 10/316:15 am -
2 stops18h 45m
Deal found 9/23![Multiple Airlines logo]()
$775
This Mytrip deal was found by Cheapflights users on 9/26. 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 10/43:40 pm -
2 stops20h 20m
Tue 10/208:50 am -
2 stops17h 05m
Deal found 9/26![Multiple Airlines logo]()
$775
This Delta deal was found by Cheapflights users on 9/23. 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 10/139:50 pm -
Nonstop9h 45m
Wed 10/2111:45 am -
1 stop12h 50m
Deal found 9/23![Delta logo]()
$775
This Booking.com deal was found by Cheapflights users on 9/24. 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.
Thu 10/227:00 pm -
2 stops21h 30m
Thu 10/297:20 am -
2 stops17h 40m
Deal found 9/24![Multiple Airlines logo]()
$776
This Cheapflightsfares deal was found by Cheapflights users on 9/23. 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 10/115:40 pm -
1 stop17h 10m
Tue 10/2710:25 am -
1 stop13h 30m
Deal found 9/23![Condor logo]()
$776
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 27, 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 27, 2026.
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/77:05 pm -
1 stop32h 45m
Sat 11/144:40 pm -
1 stop28h 20m
Deal found 9/23![United Airlines logo]()
$777
This Delta deal was found by Cheapflights users on 9/23. 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 11/264:50 pm -
Nonstop9h 50m
Fri 1/1512:20 pm -
Nonstop10h 25m
Deal found 9/23![Delta logo]()
$784
This Virgin Atlantic deal was found by Cheapflights users on 9/22. 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 11/47:15 am -
2 stops24h 30m
Mon 11/1610:00 am -
1 stop13h 14m
Deal found 9/22![Virgin Atlantic logo]()
$796
This Alaska Airlines deal was found by Cheapflights users on 9/22. 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 11/216:45 pm -
Nonstop9h 35m
Mon 11/302:45 pm -
Nonstop10h 15m
Deal found 9/22![Alaska Airlines logo]()
$849
This Scandinavian Airlines deal was found by Cheapflights users on 9/24. 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 11/82:30 pm -
2 stops20h 00m
Tue 11/2410:20 am -
2 stops19h 44m
Deal found 9/24![Scandinavian Airlines logo]()
$861
This Condor deal was found by Cheapflights users on 9/25. 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 Condor is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:05 pm -
1 stop16h 45m
Sat 11/710:25 am -
1 stop13h 30m
Deal found 9/25![Condor logo]()
$887
This Turkish Airlines deal was found by Cheapflights users on 9/26. 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 11/167:05 pm -
1 stop30h 50m
Sun 11/225:20 pm -
1 stop31h 50m
Deal found 9/26![Turkish Airlines logo]()
$936
This Icelandair deal was found by Cheapflights users on 9/23. 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.
Mon 11/239:37 pm -
2 stops29h 13m
Mon 1/1112:15 pm -
1 stop12h 45m
Deal found 9/23![Icelandair logo]()
$1,012
This Finnair deal was found by Cheapflights users on 9/27. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/47:51 am -
1 stop14h 29m
Tue 10/204:30 pm -
Nonstop9h 55m
Deal found 9/27![Finnair logo]()
$1,029
This KLM deal was found by Cheapflights users on 9/24. 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 10/215:30 pm -
Nonstop9h 50m
Sun 10/2512:20 pm -
Nonstop10h 34m
Deal found 9/24![KLM logo]()
$1,079
This KAYAK deal was found by Cheapflights users on 9/23. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/93:25 pm -
1 stop16h 20m
Fri 11/1310:00 am -
2 stops20h 04m
Deal found 9/23![Air France logo]()
$1,168
This Virgin Atlantic deal was found by Cheapflights users on 9/26. 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 11/104:05 pm -
1 stop15h 40m
Tue 11/1710:00 am -
2 stops21h 00m
Deal found 9/26![Virgin Atlantic logo]()
$920
This Delta deal was found by Cheapflights users on 9/22. 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 11/273:25 pm -
1 stop16h 20m
Wed 12/910:00 am -
1 stop13h 13m
Deal found 9/22![Delta logo]()
$926
This Turkish Airlines deal was found by Cheapflights users on 9/25. 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 10/298:05 pm -
1 stop37h 15m
Sat 11/75:20 pm -
1 stop31h 50m
Deal found 9/25![Turkish Airlines logo]()
$937
This United Airlines deal was found by Cheapflights users on 9/25. 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 10/111:14 pm -
1 stop23h 41m
Sun 10/46:50 am -
2 stops21h 47m
Deal found 9/25![United Airlines logo]()
$985
This Turkish Airlines deal was found by Cheapflights users on 9/22. 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.
Sun 11/157:05 pm -
1 stop37h 15m
Sun 11/2210:55 am -
1 stop38h 15m
Deal found 9/22![Turkish Airlines logo]()
$938
This Delta deal was found by Cheapflights users on 9/25. 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 10/285:45 pm -
Nonstop9h 55m
Sun 11/86:30 am -
1 stop13h 17m
Deal found 9/25![Delta logo]()
$949
This KLM deal was found by Cheapflights users on 9/24. 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.
Sat 10/109:50 pm -
Nonstop9h 45m
Sat 10/175:45 pm -
Nonstop10h 29m
Deal found 9/24![KLM logo]()
$1,129
This Turkish Airlines deal was found by Cheapflights users on 9/24. 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 10/217:15 pm -
1 stop37h 25m
Sun 10/255:20 pm -
1 stop31h 50m
Deal found 9/24![Turkish Airlines logo]()
$938
This Condor deal was found by Cheapflights users on 9/25. 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 Condor is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:45 pm -
2 stops33h 55m
Sun 11/84:10 pm -
1 stop31h 45m
Deal found 9/25![Condor logo]()
$1,146
This Delta deal was found by Cheapflights users on 9/25. 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 11/164:50 pm -
Nonstop9h 50m
Sun 11/228:55 am -
1 stop14h 19m
Deal found 9/25![Delta logo]()
$956
This Turkish Airlines deal was found by Cheapflights users on 9/27. 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 11/28:05 pm -
1 stop29h 50m
Fri 11/1310:55 am -
1 stop38h 15m
Deal found 9/27![Turkish Airlines logo]()
$943
This Delta deal was found by Cheapflights users on 9/26. 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 11/43:25 pm -
1 stop33h 35m
Sun 11/810:00 am -
2 stops21h 56m
Deal found 9/26![Delta logo]()
$971
This Turkish Airlines deal was found by Cheapflights users on 9/24. 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 10/288:05 pm -
1 stop37h 25m
Sun 11/85:25 pm -
1 stop31h 45m
Deal found 9/24![Turkish Airlines logo]()
$946
This Delta deal was found by Cheapflights users on 9/27. 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 10/219:50 pm -
Nonstop9h 45m
Sat 10/318:55 am -
1 stop12h 55m
Deal found 9/27![Delta logo]()
$1,055
This Turkish Airlines deal was found by Cheapflights users on 9/26. 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.
Fri 10/97:15 pm -
1 stop30h 40m
Sun 10/185:35 pm -
1 stop31h 45m
Deal found 9/26![Turkish Airlines logo]()
$976
This KAYAK deal was found by Cheapflights users on 9/22. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/93:25 pm -
1 stop16h 20m
Fri 11/1310:00 am -
1 stop13h 14m
Deal found 9/22![Delta logo]()
$1,101
This Turkish Airlines deal was found by Cheapflights users on 9/25. 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 10/147:15 pm -
1 stop30h 40m
Sat 11/75:20 pm -
1 stop31h 50m
Deal found 9/25![Turkish Airlines logo]()
$1,007
This Turkish Airlines deal was found by Cheapflights users on 9/24. 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 11/121:16 pm -
2 stops43h 04m
Tue 11/175:20 pm -
1 stop31h 50m
Deal found 9/24![Turkish Airlines logo]()
$1,099
This Turkish Airlines deal was found by Cheapflights users on 9/24. 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 11/121:16 pm -
2 stops35h 54m
Tue 11/1710:05 am -
1 stop39h 05m
Deal found 9/24![Turkish Airlines logo]()
$1,107
Last-minute flights from Seattle to LondonDiscover last-minute flight deals from Seattle to London. Data last updated September 27, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to London. Data last updated September 27, 2026 and is based on user searches.
This Justfly.com deal was found by Cheapflights users on 9/23. 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.
Thu 10/16:50 pm -
1 stop19h 50m
Tue 10/201:50 pm -
2 stops36h 42m
Deal found 9/23![Multiple Airlines logo]()
$774
This Mytrip deal was found by Cheapflights users on 9/26. 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 10/43:40 pm -
2 stops20h 20m
Tue 10/208:50 am -
2 stops17h 05m
Deal found 9/26![Multiple Airlines logo]()
$775
This Delta deal was found by Cheapflights users on 9/23. 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 10/59:50 pm -
Nonstop9h 45m
Mon 10/125:45 pm -
Nonstop10h 29m
Deal found 9/23![Delta logo]()
$777
This Air Canada deal was found by Cheapflights users on 9/22. 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 10/57:15 pm -
2 stops53h 20m
Mon 10/1210:15 am -
2 stops20h 32m
Deal found 9/22![Air Canada logo]()
$778
This American Airlines deal was found by Cheapflights users on 9/22. 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.
Wed 10/75:00 am -
2 stops19h 35m
Tue 10/132:30 pm -
1 stop27h 51m
Deal found 9/22![Multiple Airlines logo]()
$777
This oojo deal was found by Cheapflights users on 9/23. 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 10/93:40 pm -
1 stop15h 00m
Tue 10/203:40 pm -
1 stop13h 00m
Deal found 9/23![Icelandair logo]()
$779
This Cheapflightsfares deal was found by Cheapflights users on 9/23. 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 10/115:40 pm -
1 stop17h 10m
Tue 10/2710:25 am -
1 stop13h 30m
Deal found 9/23![Condor logo]()
$776
This FlightHub deal was found by Cheapflights users on 9/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/113:00 pm -
2 stops22h 00m
Sun 10/187:25 am -
1 stop17h 34m
Deal found 9/23![Multiple Airlines logo]()
$776
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 10/127:00 pm -
1 stop11h 40m
Tue 10/203:40 pm -
1 stop13h 00m
Deal found 9/23![Icelandair logo]()
$774
This Delta deal was found by Cheapflights users on 9/23. 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 10/139:50 pm -
Nonstop9h 45m
Wed 10/2111:45 am -
1 stop12h 50m
Deal found 9/23![Delta logo]()
$775
This Booking.com deal was found by Cheapflights users on 9/24. 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.
Thu 10/227:00 pm -
2 stops21h 30m
Thu 10/297:20 am -
2 stops17h 40m
Deal found 9/24![Multiple Airlines logo]()
$776
This Mytrip deal was found by Cheapflights users on 9/23. 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 10/237:00 pm -
2 stops18h 10m
Sat 10/316:15 am -
2 stops18h 45m
Deal found 9/23![Multiple Airlines logo]()
$775
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 27, 2026.
Search for one-way flight options from Seattle to London. Find affordable one-way fares based on user searches. Data last updated September 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 10/77:00 pm -
2 stops52h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Multiple Airlines logo]()
$335
This Mytrip deal was found by Cheapflights users on 9/26. 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 11/218:40 am -
2 stops20h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Multiple Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 9/27. 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 10/2410:30 am -
3 stops52h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Multiple Airlines logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 10/33:55 pm -
1 stop33h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 10/63:55 pm -
3 stops33h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 10/293:35 pm -
2 stops24h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Multiple Airlines logo]()
$338
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 10/263:35 pm -
2 stops18h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Multiple Airlines logo]()
$338
This Mytrip deal was found by Cheapflights users on 9/25. 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 -
3 stops21h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Multiple Airlines logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 12/52:35 pm -
3 stops24h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Multiple Airlines logo]()
$340
This Mytrip deal was found by Cheapflights users on 9/23. 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 10/23:55 pm -
1 stop16h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Scandinavian Airlines logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 10/207:00 pm -
2 stops18h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Multiple Airlines logo]()
$341
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 10/810:30 am -
1 stop17h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![WestJet logo]()
$342
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 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $771 (Kiwi.com) |
One-way from | $335 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $926 |
Good round-trip deal | $841 or less |
Good one-way deal | $452 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 27, 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 - STN London Stansted
SEASTN
Seattle/Tacoma Intl
Mon 10/5
3:40 pm-7:15 pm
2 stops19h 35m
London Stansted
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$364
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Sat 12/26
11:58 pm-10:15 am
1 stop26h 17m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$372
SeattleLondon
SEA Seattle/Tacoma Intl - LHR London Heathrow
SEALHR
Seattle/Tacoma Intl
Wed 10/28
3:15 pm-11:50 am
1 stop13h 35m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$374
SeattleLondon
SEA Seattle/Tacoma Intl - LGW London Gatwick
SEALGW
Seattle/Tacoma Intl
Wed 10/28
4:20 pm-3:45 pm
1 stop16h 25m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$379
SeattleLondon
SEA Seattle/Tacoma Intl - LGW London Gatwick
SEALGW
Seattle/Tacoma Intl
Mon 11/9
3:25 pm-3:45 pm
1 stop16h 20m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$379
SeattleLondon
SEA Seattle/Tacoma Intl - LGW London Gatwick
SEALGW
Seattle/Tacoma Intl
Mon 11/9
9:45 am-3:45 pm
2 stops22h 00m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$384
SeattleLondon
SEA Seattle/Tacoma Intl - LGW London Gatwick
SEALGW
Seattle/Tacoma Intl
Mon 11/9
2:35 pm-7:00 pm
3 stops20h 25m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$396
SeattleLondon
SEA Seattle/Tacoma Intl - LGW London Gatwick
SEALGW
Seattle/Tacoma Intl
Thu 12/17
2:35 pm-10:55 am
1 stop12h 20m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$400
SeattleLondon
SEA Seattle/Tacoma Intl - LGW London Gatwick
SEALGW
Seattle/Tacoma Intl
Tue 10/6
6:05 pm-6:50 pm
1 stop16h 45m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$400
SeattleLondon
SEA Seattle/Tacoma Intl - STN London Stansted
SEASTN
Seattle/Tacoma Intl
Tue 10/6
3:55 pm-2:35 pm
1 stop14h 40m
London Stansted
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$418
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-STN
SEA-LHR
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-STN
SEA-LHR
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 $678). 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 27, 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 27, 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 typical for this route at the moment.
Seattle to London flights typically cost between $711 and $991 in November.The cheapest round-trip price found within the last 5 days was $771 on Multiple Airlines (Nov 30-Dec 14).
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 14% of weekly flights between Seattle and London have experienced delays in the past year, with the average delay time being 130 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 64 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 27, 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.
Boarding
8.1
Overall
7.9
Entertainment
7.0
Food
7.0
Crew
8.5
Comfort
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Boarding
8.1
Overall
7.9
Entertainment
7.0
Food
7.0
Crew
8.5
Comfort
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Boarding
8.1
Overall
7.9
Entertainment
7.0
Food
7.0
Crew
8.5
Comfort
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Boarding
8.1
Overall
7.9
Entertainment
7.0
Food
7.0
Crew
8.5
Comfort
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Boarding
8.1
Overall
7.9
Entertainment
7.0
Food
7.0
Crew
8.5
Comfort
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Boarding
8.1
Overall
7.9
Entertainment
7.0
Food
7.0
Crew
8.5
Comfort
7.8
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
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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 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$506 | Average$715 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$535 | Average$782 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$559 | Average$986 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$560 | Average$694 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$564 | Average$993 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$584 | Average$891 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$584 | Average$842 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$595 | Average$922 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$640 | Average$992 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$648 | Average$851 | FlexibilityNo cancel fee | On-time77% |