$509+ Cheap flights from London (LON) to Seattle (SEA)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
Oct 4 — Oct 111
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 84 days in advance, depart on a Monday or Sunday 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 September 4, 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 September 4, 2026.
This United Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/208:00 am -
2 stops23h 16m
Sun 12/2711:58 pm -
1 stop23h 42m
Deal found 9/3![United Airlines logo]()
$668
This Air Canada deal was found by Cheapflights users on 9/3. 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 12/203:00 pm -
2 stops38h 57m
Sat 12/268:15 am -
1 stop19h 35m
Deal found 9/3![Air Canada logo]()
$670
This United Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/17:30 am -
2 stops21h 18m
Sat 1/211:44 pm -
2 stops27h 06m
Deal found 9/4![United Airlines logo]()
$674
This deal was found by Cheapflights users on 9/3. 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.
Thu 12/242:45 pm -
Nonstop10h 05m
Thu 12/316:55 pm -
Nonstop9h 25m
Deal found 9/3![Alaska Airlines logo]()
$675
This SWISS deal was found by Cheapflights users on 9/3. 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.
Sat 10/249:25 am -
2 stops19h 38m
Sun 11/11:16 pm -
2 stops20h 34m
Deal found 9/3![SWISS logo]()
$677
This Air Canada deal was found by Cheapflights users on 9/3. 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 12/203:00 pm -
2 stops31h 37m
Mon 12/287:45 am -
1 stop19h 35m
Deal found 9/3![Air Canada logo]()
$678
This SWISS deal was found by Cheapflights users on 9/4. 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.
Sun 11/226:00 am -
2 stops25h 07m
Fri 1/83:30 pm -
2 stops18h 20m
Deal found 9/4![SWISS logo]()
$679
This Air Canada deal was found by Cheapflights users on 9/3. 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 10/189:05 am -
2 stops21h 42m
Sun 10/257:45 am -
2 stops27h 05m
Deal found 9/3![Multiple Airlines logo]()
$680
This Travcart deal was found by Cheapflights users on 9/3. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/232:45 pm -
1 stop31h 05m
Fri 1/19:25 am -
1 stop16h 35m
Deal found 9/3![Virgin Atlantic logo]()
$680
This Trip.com deal was found by Cheapflights users on 9/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:55 am -
1 stop15h 47m
Thu 9/1712:55 pm -
1 stop15h 50m
Deal found 9/2![Multiple Airlines logo]()
$681
This Air Canada deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/296:35 am -
2 stops19h 47m
Thu 1/147:05 pm -
2 stops28h 05m
Deal found 9/2![Multiple Airlines logo]()
$683
This Icelandair deal was found by Cheapflights users on 9/3. 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.
Sat 9/123:40 pm -
1 stop28h 05m
Mon 9/283:40 pm -
1 stop15h 00m
Deal found 9/3![Icelandair logo]()
$685
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 September 4, 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 September 4, 2026.
This SWISS deal was found by Cheapflights users on 9/2. 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.
Thu 2/46:00 am -
2 stops24h 39m
Mon 2/83:30 pm -
2 stops18h 20m
Deal found 9/2![SWISS logo]()
$689
This Alaska Airlines deal was found by Cheapflights users on 9/1. 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.
Tue 12/222:45 pm -
Nonstop10h 05m
Wed 12/306:55 pm -
Nonstop9h 25m
Deal found 9/1![Alaska Airlines logo]()
$737
This Virgin Atlantic deal was found by Cheapflights users on 9/1. 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.
Fri 11/205:50 pm -
1 stop25h 57m
Sun 12/132:35 pm -
1 stop18h 00m
Deal found 9/1![Virgin Atlantic logo]()
$788
This United Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2211:35 am -
2 stops19h 43m
Sat 1/27:10 pm -
1 stop30h 30m
Deal found 9/3![United Airlines logo]()
$826
This Mytrip deal was found by Cheapflights users on 9/4. 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 10/207:05 am -
3 stops21h 35m
Tue 10/273:35 pm -
2 stops23h 05m
Deal found 9/4![Multiple Airlines logo]()
$842
This KLM deal was found by Cheapflights users on 9/3. 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.
Sun 10/410:25 am -
1 stop15h 22m
Sun 10/111:30 pm -
1 stop11h 55m
Deal found 9/3![Air France logo]()
$911
This Delta deal was found by Cheapflights users on 9/2. 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 10/46:30 am -
1 stop18h 05m
Fri 10/99:50 pm -
Nonstop9h 45m
Deal found 9/2![Delta logo]()
$944
This Turkish Airlines deal was found by Cheapflights users on 8/30. 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 11/225:20 pm -
2 stops37h 57m
Thu 12/310:49 am -
2 stops39h 06m
Deal found 8/30![Turkish Airlines logo]()
$992
This Icelandair deal was found by Cheapflights users on 9/2. 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 2/311:55 am -
1 stop13h 05m
Mon 2/89:40 pm -
2 stops29h 15m
Deal found 9/2![Icelandair logo]()
$1,014
This KLM deal was found by Cheapflights users on 8/31. 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.
Tue 9/1510:00 am -
1 stop14h 35m
Sun 9/271:50 pm -
1 stop11h 40m
Deal found 8/31![KLM logo]()
$1,116
This SWISS deal was found by Cheapflights users on 9/2. 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.
Thu 2/49:15 am -
2 stops21h 24m
Sun 2/710:54 am -
2 stops17h 56m
Deal found 9/2![SWISS logo]()
$757
This SWISS deal was found by Cheapflights users on 9/2. 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 2/59:15 am -
2 stops19h 33m
Sun 2/710:54 am -
2 stops17h 56m
Deal found 9/2![SWISS logo]()
$757
This Mytrip deal was found by Cheapflights users on 9/1. 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 10/86:05 am -
2 stops17h 55m
Mon 10/126:10 pm -
2 stops20h 05m
Deal found 9/1![Multiple Airlines logo]()
$894
This SWISS deal was found by Cheapflights users on 8/31. 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 9/169:15 am -
2 stops17h 17m
Wed 9/233:30 pm -
2 stops17h 55m
Deal found 8/31![SWISS logo]()
$788
This Turkish Airlines deal was found by Cheapflights users on 8/31. 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 1/1810:55 am -
1 stop38h 15m
Sun 1/2410:54 am -
2 stops45h 26m
Deal found 8/31![Turkish Airlines logo]()
$999
This Delta deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1710:00 am -
1 stop14h 35m
Mon 9/215:45 pm -
1 stop14h 55m
Deal found 9/3![Delta logo]()
$1,011
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 -
1 stop16h 10m
Sun 9/277:10 pm -
1 stop12h 15m
Deal found 9/2![Multiple Airlines logo]()
$924
This SWISS deal was found by Cheapflights users on 8/31. 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 9/159:15 am -
2 stops17h 17m
Mon 9/287:00 am -
2 stops21h 35m
Deal found 8/31![SWISS logo]()
$827
This Turkish Airlines deal was found by Cheapflights users on 9/2. 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 2/55:20 pm -
2 stops37h 19m
Mon 2/87:05 pm -
1 stop30h 50m
Deal found 9/2![Turkish Airlines logo]()
$1,005
This TAP AIR PORTUGAL deal was found by Cheapflights users on 9/4. 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.
Tue 10/2011:20 am -
3 stops42h 35m
Wed 11/116:30 am -
3 stops27h 00m
Deal found 9/4![TAP AIR PORTUGAL logo]()
$2,212
This Philippine Airlines deal was found by Cheapflights users on 9/4. 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 Philippine Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/42:15 pm -
2 stops36h 15m
Thu 11/129:30 pm -
2 stops48h 55m
Deal found 9/4![Philippine Airlines logo]()
$2,241
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 9/159:40 am -
2 stops17h 05m
Tue 9/297:10 pm -
1 stop12h 20m
Deal found 9/1![Multiple Airlines logo]()
$930
This Mytrip deal was found by Cheapflights users on 9/2. 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 9/299:40 am -
2 stops17h 05m
Wed 10/77:00 pm -
2 stops19h 15m
Deal found 9/2![Multiple Airlines logo]()
$934
This SWISS deal was found by Cheapflights users on 9/3. 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 9/309:25 am -
2 stops17h 07m
Sat 10/107:00 am -
2 stops17h 20m
Deal found 9/3![SWISS logo]()
$850
This Turkish Airlines deal was found by Cheapflights users on 9/1. 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 11/205:20 pm -
2 stops37h 57m
Sun 12/137:05 pm -
1 stop37h 15m
Deal found 9/1![Turkish Airlines logo]()
$1,053
This Alaska Airlines deal was found by Cheapflights users on 9/2. 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.
Mon 9/145:00 pm -
Nonstop10h 00m
Sat 9/199:40 pm -
Nonstop9h 25m
Deal found 9/2![Alaska Airlines logo]()
$1,330
This Mytrip deal was found by Cheapflights users on 9/2. 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 11/238:00 am -
1 stop17h 00m
Wed 12/22:35 pm -
2 stops18h 45m
Deal found 9/2![Multiple Airlines logo]()
$937
This SWISS deal was found by Cheapflights users on 9/2. 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 10/69:25 am -
2 stops21h 31m
Thu 10/157:00 am -
2 stops17h 25m
Deal found 9/2![SWISS logo]()
$857
This Turkish Airlines deal was found by Cheapflights users on 9/3. 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 10/155:35 pm -
1 stop31h 45m
Mon 10/197:15 pm -
1 stop37h 35m
Deal found 9/3![Turkish Airlines logo]()
$1,054
This Mytrip deal was found by Cheapflights users on 8/31. 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 11/28:00 am -
1 stop17h 00m
Fri 1/152:30 pm -
2 stops21h 55m
Deal found 8/31![Multiple Airlines logo]()
$961
Last-minute flights from London to SeattleDiscover last-minute flight deals from London to Seattle. Data last updated September 4, 2026 and is based on user searches.
Discover last-minute flight deals from London to Seattle. Data last updated September 4, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 9/3. 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 9/105:00 pm -
Nonstop10h 00m
Thu 9/179:40 pm -
Nonstop9h 25m
Deal found 9/3![Alaska Airlines logo]()
$679
This Alaska Airlines deal was found by Cheapflights users on 9/2. 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 9/125:00 pm -
Nonstop10h 00m
Sun 9/209:40 pm -
Nonstop9h 25m
Deal found 9/2![Alaska Airlines logo]()
$680
This Trip.com deal was found by Cheapflights users on 9/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:55 am -
1 stop15h 47m
Thu 9/1712:55 pm -
1 stop15h 50m
Deal found 9/2![Multiple Airlines logo]()
$681
This Icelandair deal was found by Cheapflights users on 9/3. 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.
Sat 9/123:40 pm -
1 stop28h 05m
Mon 9/283:40 pm -
1 stop15h 00m
Deal found 9/3![Icelandair logo]()
$685
This SWISS deal was found by Cheapflights users on 9/2. 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.
Thu 9/179:15 am -
2 stops17h 17m
Tue 9/223:30 pm -
2 stops17h 55m
Deal found 9/2![SWISS logo]()
$693
This Mytrip deal was found by Cheapflights users on 9/3. 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 10/125:40 pm -
2 stops30h 00m
Tue 10/206:05 pm -
2 stops18h 50m
Deal found 9/3![Multiple Airlines logo]()
$692
This KAYAK deal was found by Cheapflights users on 9/4. 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.
Thu 10/159:45 am -
1 stop22h 51m
Thu 10/221:30 pm -
Nonstop9h 15m
Deal found 9/4![Multiple Airlines logo]()
$686
This Air Canada deal was found by Cheapflights users on 9/3. 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 10/189:05 am -
2 stops21h 42m
Sun 10/257:45 am -
2 stops27h 05m
Deal found 9/3![Multiple Airlines logo]()
$680
This Expedia deal was found by Cheapflights users on 9/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2010:00 am -
1 stop14h 35m
Wed 11/119:40 am -
2 stops15h 50m
Deal found 9/1![KLM logo]()
$690
This Trip.com deal was found by Cheapflights users on 9/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2010:35 am -
1 stop15h 12m
Wed 11/113:25 pm -
1 stop16h 20m
Deal found 9/2![Multiple Airlines logo]()
$693
This SWISS deal was found by Cheapflights users on 9/3. 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.
Sat 10/249:25 am -
2 stops19h 38m
Sun 11/11:16 pm -
2 stops20h 34m
Deal found 9/3![SWISS logo]()
$677
This oojo deal was found by Cheapflights users on 9/3. 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.
Sat 10/3111:55 am -
1 stop13h 05m
Tue 11/32:35 pm -
1 stop12h 20m
Deal found 9/3![Icelandair logo]()
$688
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 September 4, 2026.
Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated September 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/82:10 pm -
1 stop12h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![WestJet logo]()
$509
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 12/107:00 am -
2 stops38h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Multiple Airlines logo]()
$509
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 9/1812:40 pm -
2 stops38h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Multiple Airlines logo]()
$510
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 9/146:05 am -
3 stops35h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Multiple Airlines logo]()
$510
This Delta deal was found by Cheapflights users on 9/2. 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 10/318:40 am -
2 stops19h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Delta logo]()
$510
This Delta deal was found by Cheapflights users on 9/3. 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 11/1810:00 am -
1 stop13h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Delta logo]()
$511
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 9/153:00 pm -
3 stops50h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Multiple Airlines logo]()
$511
This Kiwi.com deal was found by Cheapflights users on 8/30. 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 10/196:45 am -
2 stops18h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/30![Multiple Airlines logo]()
$511
This Booking.com deal was found by Cheapflights users on 8/31. 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.
Tue 1/56:15 pm -
1 stop25h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/31![Lufthansa logo]()
$512
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 9/1112:40 pm -
2 stops38h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Multiple Airlines logo]()
$513
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 10/208:20 pm -
3 stops28h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Multiple Airlines logo]()
$513
This Kiwi.com deal was found by Cheapflights users on 8/30. 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 10/209:50 pm -
3 stops27h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/30![Multiple Airlines logo]()
$513
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 September 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $668 (United Airlines) |
One-way from | $509 (Kiwi.com) |
Popular in | August |
Cheapest in | February |
Average price | $733 |
Good round-trip deal | $728 or less |
Good one-way deal | $547 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 7,457,451 searches. Data last updated September 4, 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
Quickest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 11/18
2:55 pm-4:50 pm
Nonstop9h 55m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$510
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sun 11/1
7:30 am-1:35 am
2 stops25h 05m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$513
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 3/1
6:30 am-5:27 pm
2 stops18h 57m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$515
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Thu 12/10
4:45 pm-10:41 am
2 stops25h 56m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$517
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 10/28
6:50 am-8:56 pm
2 stops21h 06m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$517
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Tue 12/15
10:00 am-11:10 pm
2 stops21h 10m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$517
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Sat 11/14
10:00 am-11:00 pm
2 stops21h 00m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$518
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Sun 12/27
11:55 am-5:00 pm
1 stop13h 05m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$521
LondonSeattle
SEN London Southend - SEA Seattle/Tacoma Intl
SENSEA
London Southend
Thu 12/10
3:40 pm-8:00 am
2 stops48h 20m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$522
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sun 11/1
12:20 pm-2:50 pm
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$523
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 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 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
LGW-SEA
LHR-SEA
LCY-SEA
STN-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
LGW-SEA
LHR-SEA
LCY-SEA
STN-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 $647). Flying from London to Seattle in July is currently the most expensive (average of $859). 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 September 4, 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 September 4, 2026.
The most flights from LON to SEA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 on average).
How much does it cost to fly round-trip from London to Seattle?
Airfare is typical for this route at the moment.
London to Seattle flights typically cost between $641 and $848 in December.The cheapest round-trip price found within the last 5 days was $668 on United Airlines (Dec 20-Dec 27).
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 131 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 6% 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 September 4, 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.
Comfort
7.8
Boarding
8.1
Food
7.0
Crew
8.5
Overall
7.9
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Comfort
7.8
Boarding
8.1
Food
7.0
Crew
8.5
Overall
7.9
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Comfort
7.8
Boarding
8.1
Food
7.0
Crew
8.5
Overall
7.9
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Comfort
7.8
Boarding
8.1
Food
7.0
Crew
8.5
Overall
7.9
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Comfort
7.8
Boarding
8.1
Food
7.0
Crew
8.5
Overall
7.9
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Comfort
7.8
Boarding
8.1
Food
7.0
Crew
8.5
Overall
7.9
Entertainment
7.0
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
Puyallup
Lynnwood
Centralia
Kent
Tumwater
Ellensburg
Issaquah
Marysville
Ocean Shores
Lakewood
Fife
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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London and Seattle flights
Browse other London and Seattle flight options. Last updated on September 4, 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 September 4, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 4, 2026.
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 7,457,451 searches. Data last updated September 4, 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$670 | Average$914 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$686 | Average$911 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$759 | Average$865 | FlexibilityNo cancel fee | On-time75% |