$518+ Cheap flights from Heathrow (LHR) to Seattle (SEA)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
Sep 20 — Sep 271
Round-trip
1 adult, Economy
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Find cheap flights from Heathrow to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in January or February, booked 57 days in advance, depart on a Monday or Wednesday and return on a Wednesday
Cheap flight deals from Heathrow to Seattle
Cheapest
Best
Last-minute
One-way
Cheapest flights from Heathrow to SeattleExplore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
This Gotogate deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:25 pm -
1 stop22h 20m
Tue 2/232:35 pm -
1 stop12h 15m
Deal found 8/16![Icelandair logo]()
$629
This TravelUp deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/178:35 pm -
1 stop28h 25m
Tue 12/82:35 pm -
1 stop12h 15m
Deal found 8/16![Icelandair logo]()
$636
This Aunt Betty deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Aunt Betty is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:15 pm -
1 stop12h 45m
Tue 11/172:35 pm -
1 stop20h 55m
Deal found 8/17![Icelandair logo]()
$637
This Gotogate deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:25 pm -
1 stop22h 20m
Mon 9/73:40 pm -
1 stop12h 15m
Deal found 8/17![Icelandair logo]()
$639
This ChecknFly deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:25 pm -
1 stop22h 20m
Tue 9/87:00 pm -
1 stop17h 20m
Deal found 8/16![Icelandair logo]()
$643
This Ticket deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/89:25 pm -
1 stop28h 30m
Wed 10/213:40 pm -
1 stop12h 15m
Deal found 8/17![Icelandair logo]()
$645
This The Travel House deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/138:35 pm -
1 stop28h 25m
Mon 12/282:35 pm -
1 stop20h 55m
Deal found 8/16![Icelandair logo]()
$647
This TravelUp deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/79:25 pm -
1 stop22h 20m
Mon 9/213:40 pm -
1 stop12h 15m
Deal found 8/17![Icelandair logo]()
$649
This ChecknFly deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:25 pm -
1 stop22h 20m
Tue 9/83:40 pm -
1 stop20h 40m
Deal found 8/16![Icelandair logo]()
$650
This ChecknFly deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:25 pm -
1 stop28h 30m
Tue 9/297:00 pm -
1 stop17h 20m
Deal found 8/17![Icelandair logo]()
$651
This Globehunters deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/37:25 am -
1 stop17h 34m
Thu 10/87:15 pm -
1 stop34h 05m
Deal found 8/18![Multiple Airlines logo]()
$652
This Globehunters deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:30 am -
1 stop13h 50m
Sat 10/318:40 am -
1 stop20h 10m
Deal found 8/18![Multiple Airlines logo]()
$653
Best flights from Heathrow to SeattleDiscover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/154:15 pm -
1 stop36h 28m
Wed 9/1611:00 pm -
2 stops23h 30m
Deal found 8/18![United Airlines logo]()
$696
This British Airways deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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.
Mon 12/72:55 pm -
Nonstop9h 55m
Mon 12/1412:47 pm -
1 stop15h 13m
Deal found 8/20![British Airways logo]()
$750
This Delta deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2612:20 pm -
Nonstop10h 30m
Tue 1/54:55 pm -
Nonstop9h 45m
Deal found 8/20![Delta logo]()
$757
This Air Canada deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/182:05 pm -
2 stops16h 42m
Tue 9/225:50 am -
2 stops16h 40m
Deal found 8/20![Air Canada logo]()
$757
This KLM deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:40 am -
Nonstop10h 20m
Tue 9/229:50 pm -
Nonstop9h 45m
Deal found 8/20![KLM logo]()
$801
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 9/206:50 am -
2 stops17h 20m
Sun 9/279:05 am -
2 stops17h 05m
Deal found 8/20![United Airlines logo]()
$726
This Delta deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/811:40 am -
Nonstop10h 20m
Wed 10/215:30 pm -
Nonstop9h 50m
Deal found 8/16![Delta logo]()
$769
This British Airways deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:50 am -
Nonstop9h 45m
Sun 10/188:20 pm -
Nonstop9h 25m
Deal found 8/15![British Airways logo]()
$773
This British Airways deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” 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.
Thu 10/12:25 pm -
1 stop15h 11m
Sun 10/111:30 pm -
Nonstop9h 15m
Deal found 8/19![British Airways logo]()
$778
This Delta deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:45 pm -
Nonstop10h 25m
Sat 9/269:40 am -
1 stop16h 20m
Deal found 8/16![Delta logo]()
$811
Last-minute flights from Heathrow to SeattleDiscover last-minute flight deals from Heathrow to Seattle. Data last updated August 21, 2026 and is based on user searches.
Discover last-minute flight deals from Heathrow to Seattle. Data last updated August 21, 2026 and is based on user searches.
This Gotogate deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:25 pm -
1 stop22h 20m
Tue 2/232:35 pm -
1 stop12h 15m
Deal found 8/16![Icelandair logo]()
$629
This Gotogate deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:25 pm -
1 stop22h 20m
Mon 9/73:40 pm -
1 stop12h 15m
Deal found 8/17![Icelandair logo]()
$639
This ChecknFly deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:25 pm -
1 stop22h 20m
Tue 9/87:00 pm -
1 stop17h 20m
Deal found 8/16![Icelandair logo]()
$643
This Gotogate deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/319:25 pm -
1 stop22h 20m
Tue 9/227:00 pm -
1 stop17h 20m
Deal found 8/16![Icelandair logo]()
$658
This ChecknFly deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:25 pm -
1 stop22h 20m
Tue 9/83:40 pm -
1 stop20h 40m
Deal found 8/16![Icelandair logo]()
$650
This oojo deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:25 pm -
1 stop22h 20m
Wed 9/307:00 pm -
1 stop17h 20m
Deal found 8/16![Icelandair logo]()
$654
This Ticket deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/49:25 pm -
1 stop22h 20m
Tue 9/87:00 pm -
1 stop17h 20m
Deal found 8/19![Icelandair logo]()
$655
This TravelUp deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/79:25 pm -
1 stop22h 20m
Mon 9/213:40 pm -
1 stop12h 15m
Deal found 8/17![Icelandair logo]()
$649
This Globehunters deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/167:25 am -
1 stop17h 34m
Wed 9/238:00 am -
1 stop14h 35m
Deal found 8/17![Multiple Airlines logo]()
$660
This Globehunters deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/206:30 am -
1 stop13h 25m
Tue 10/203:00 pm -
1 stop14h 20m
Deal found 8/18![Multiple Airlines logo]()
$653
This ChecknFly deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:25 pm -
1 stop28h 30m
Tue 9/297:00 pm -
1 stop17h 20m
Deal found 8/17![Icelandair logo]()
$651
This Mytrip deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” 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 9/219:25 pm -
1 stop28h 30m
Mon 9/283:40 pm -
1 stop12h 15m
Deal found 8/19![Icelandair logo]()
$657
One-way flights from Heathrow to SeattleSearch for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
This SWISS deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” 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 2/159:00 am -
2 stops22h 21m
Deal found 8/19![SWISS logo]()
$518
This American Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” 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.
Thu 10/156:10 am -
2 stops22h 05m
Deal found 8/19![American Airlines logo]()
$520
This British Airways deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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.
Wed 10/216:45 am -
2 stops24h 14m
Deal found 8/18![British Airways logo]()
$521
This Mytrip deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/147:50 pm -
3 stops45h 50m
Deal found 8/18![Multiple Airlines logo]()
$522
This Alaska Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 10/65:00 pm -
Nonstop10h 00m
Deal found 8/17![Alaska Airlines logo]()
$523
This ResecentrumGruppen deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ResecentrumGruppen is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/88:45 am -
2 stops17h 47m
Deal found 8/19![Air Canada logo]()
$524
This Alaska Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” 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 12/152:45 pm -
Nonstop10h 05m
Deal found 8/19![Alaska Airlines logo]()
$525
This Iberia deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/156:05 am -
2 stops24h 06m
Deal found 8/17![Iberia logo]()
$526
This BusinessClass deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/137:30 am -
2 stops25h 06m
Deal found 8/20![Finnair logo]()
$527
This United Airlines deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/43:30 pm -
1 stop28h 50m
Deal found 8/15![United Airlines logo]()
$529
This Travelocity deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/278:30 am -
1 stop35h 25m
Deal found 8/18![Lufthansa logo]()
$530
Find flight deals from Heathrow to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $636 (TravelUp) |
One-way from | $518 (SWISS) |
Popular in | July |
Cheapest in | January |
Average price | $802 |
Good round-trip deal | $849 or less |
Good one-way deal | $589 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Heathrow to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated August 21, 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 9/15
4:15 pm-8:43 pm
1 stop36h 28m
Seattle/Tacoma Intl
Wed 9/16
11:00 pm-6:30 am
2 stops23h 30m
$696
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sun 9/20
6:50 am-4:10 pm
2 stops17h 20m
Seattle/Tacoma Intl
Sun 9/27
9:05 am-10:10 am
2 stops17h 05m
$726
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 12/7
2:55 pm-4:50 pm
Nonstop9h 55m
Seattle/Tacoma Intl
Mon 12/14
12:47 pm-12:00 pm
1 stop15h 13m
$750
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sat 12/26
12:20 pm-2:50 pm
Nonstop10h 30m
Seattle/Tacoma Intl
Tue 1/5
4:55 pm-10:40 am
Nonstop9h 45m
$757
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 9/18
2:05 pm-10:47 pm
2 stops16h 42m
Seattle/Tacoma Intl
Tue 9/22
5:50 am-6:30 am
2 stops16h 40m
$757
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 10/8
11:40 am-2:00 pm
Nonstop10h 20m
Seattle/Tacoma Intl
Wed 10/21
5:30 pm-11:20 am
Nonstop9h 50m
$769
Quickest round-trip
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 10/14
9:50 am-11:35 am
Nonstop9h 45m
Seattle/Tacoma Intl
Sun 10/18
8:20 pm-1:45 pm
Nonstop9h 25m
$773
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 10/1
2:25 pm-9:36 pm
1 stop15h 11m
Seattle/Tacoma Intl
Sun 10/11
1:30 pm-6:45 am
Nonstop9h 15m
$778
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 9/18
11:40 am-2:00 pm
Nonstop10h 20m
Seattle/Tacoma Intl
Tue 9/22
9:50 pm-3:35 pm
Nonstop9h 45m
$801
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sat 9/12
5:45 pm-8:10 pm
Nonstop10h 25m
Seattle/Tacoma Intl
Sat 9/26
9:40 am-10:00 am
1 stop16h 20m
$811
Showing 1-10 of 19 resultsSorted by cheapest first
Compare providers for flights from Heathrow to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Seattle in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on London Heathrow Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on London Heathrow Airport-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Heathrow to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.
LHR-SEA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from London Heathrow Airport to Seattle
Prices
Airlines
Delays
How far ahead should I book a flight from London Heathrow Airport to Seattle?
The best time to book flights from London Heathrow Airport to Seattle is 56 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from London Heathrow Airport to Seattle?
Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of $675). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $895). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from LHR to SEA?
Find hourly flight availability from Heathrow to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 21, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to Seattle as you normally would.
How often are flights from London to Seattle delayed?
About 11% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 130 minutes.
What is the most punctual flight time for London to Seattle flights?
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Thursday tends to have the lowest number of delays on this route, whereas Tuesday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on London to Seattle flights?
Over the last year, Delta have had the lowest number of delays on this route, with just 5% of flights being delayed.
The best insider tips for London Heathrow Airport to Seattle flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Seattle trip
Our travel experts
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated August 21, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andVirgin Atlantic from London Heathrow Airport to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Comfort
7.8
Overall
7.9
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Comfort
7.8
Overall
7.9
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Comfort
7.8
Overall
7.9
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Comfort
7.8
Overall
7.9
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Comfort
7.8
Overall
7.9
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
LHR - SEA
Crew
8.5
Comfort
7.8
Overall
7.9
Boarding
8.1
Entertainment
7.0
Food
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 Heathrow to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Tukwila
Olympia
Edmonds
Snoqualmie
Lynnwood
Tumwater
Centralia
Puyallup
Kent
Marysville
Ellensburg
Ocean Shores
Lakewood
Fife
Poulsbo
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Heathrow to Seattle
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Complete your trip
Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Heathrow to Seattle by cabin class
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Heathrow and Seattle flights
Browse other Heathrow and Seattle flight options. Last updated on August 21, 2026.
Other flights from Heathrow
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on August 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 21, 2026.
Top 7 airlines flying from Heathrow to Seattle
Discover the top 7 airlines that operate flights from Heathrow to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated August 21, 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$1,009 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$618 | Average$985 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$661 | Average$903 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$670 | Average$914 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$768 | Average$865 | FlexibilityNo cancel fee | On-time75% |