$549+ 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
Jun 8 — Jun 151
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 February or January, booked 81 days in advance, depart on a Monday or Thursday and return on a Wednesday
Cheap flight deals from Heathrow to Seattle
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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 May 9, 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 May 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/159:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Mon 6/2211:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/4![Icelandair logo]()
$705
This Icelandair deal was found by Cheapflights users on 5/4. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/199:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Wed 6/2411:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/4![Icelandair logo]()
$706
This Icelandair deal was found by Cheapflights users on 5/4. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Mon 6/111:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/4![Icelandair logo]()
$707
This Gotogate deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Wed 6/311:25 pm
SEA
- LHR
1 stop28h 30m
Icelandair
Deal found 5/8![Icelandair logo]()
$708
This Icelandair deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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.
Sun 11/88:35 pm
LHR
- SEA
1 stop28h 25m
Icelandair
Sun 11/152:35 pm
SEA
- LHR
1 stop20h 55m
Icelandair
Deal found 5/5![Icelandair logo]()
$709
This FlightHub deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/109:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Wed 6/2411:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/7![Icelandair logo]()
$710
This FlightHub deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/129:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Mon 6/2211:25 pm
SEA
- LHR
1 stop28h 30m
Icelandair
Deal found 5/7![Icelandair logo]()
$711
This FlightHub deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/249:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Fri 7/243:40 pm
SEA
- LHR
1 stop12h 15m
Icelandair
Deal found 5/9![Icelandair logo]()
$712
This FlightHub deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/179:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Fri 7/1711:25 pm
SEA
- LHR
1 stop28h 30m
Icelandair
Deal found 5/9![Icelandair logo]()
$713
This Gotogate deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/231:05 pm
LHR
- SEA
1 stop15h 35m
Icelandair
Tue 6/3011:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/9![Icelandair logo]()
$714
This Cheapflightsfares deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/19:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Wed 7/87:00 pm
SEA
- LHR
1 stop17h 20m
Icelandair
Deal found 5/7![Icelandair logo]()
$722
This Trip.com deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/219:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Fri 9/1111:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/7![Icelandair logo]()
$725
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 May 9, 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 May 9, 2026.
This Icelandair deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:05 pm
LHR
- SEA
1 stop15h 35m
Icelandair
Mon 9/213:40 pm
SEA
- LHR
1 stop12h 15m
Icelandair
Deal found 5/7![Icelandair logo]()
$751
This Alaska Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/52:45 pm
LHR
- SEA
Nonstop10h 05m
Alaska Airlines
Mon 11/96:55 pm
SEA
- LHR
Nonstop9h 25m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$804
This British Airways deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 10/129:50 am
LHR
- SEA
Nonstop9h 45m
British Airways
Fri 10/231:30 pm
SEA
- LHR
Nonstop9h 15m
British Airways
Deal found 5/5![British Airways logo]()
$842
This Finnair deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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.
Mon 8/247:30 am
LHR
- SEA
1 stop16h 30m
Finnair
Tue 9/11:17 pm
SEA
- LHR
1 stop13h 13m
Finnair
Deal found 5/5![Finnair logo]()
$844
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 10/1811:40 am
LHR
- SEA
Nonstop10h 20m
Delta
Sat 10/245:48 pm
SEA
- LHR
Nonstop9h 42m
Delta
Deal found 5/5![Delta logo]()
$863
This Scandinavian Airlines deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/263:35 pm
LHR
- SEA
2 stops30h 10m
Scandinavian Airlines
Thu 10/229:50 am
SEA
- LHR
2 stops22h 10m
Scandinavian Airlines
Deal found 5/7![Scandinavian Airlines logo]()
$877
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/35:45 pm
LHR
- SEA
Nonstop10h 28m
Delta
Thu 9/1711:50 am
SEA
- LHR
1 stop14h 50m
Delta
Deal found 5/8![Delta logo]()
$873
This British Airways deal was found by Cheapflights users on 5/4. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:50 am
LHR
- SEA
Nonstop9h 45m
British Airways
Sun 8/168:20 pm
SEA
- LHR
Nonstop9h 25m
British Airways
Deal found 5/4![British Airways logo]()
$881
This Delta deal was found by Cheapflights users on 5/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/146:30 am
LHR
- SEA
2 stops20h 35m
Delta
Mon 6/2211:59 pm
SEA
- LHR
1 stop29h 06m
Delta
Deal found 5/4![Delta logo]()
$873
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/46:30 am
LHR
- SEA
1 stop13h 17m
Delta
Mon 9/79:50 pm
SEA
- LHR
Nonstop9h 45m
Delta
Deal found 5/6![Delta logo]()
$876
This Delta deal was found by Cheapflights users on 5/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1911:45 am
LHR
- SEA
2 stops19h 23m
Delta
Sun 6/218:50 am
SEA
- LHR
1 stop15h 05m
Delta
Deal found 5/4![Delta logo]()
$879
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/75:45 pm
LHR
- SEA
Nonstop10h 18m
Delta
Wed 7/297:20 am
SEA
- LHR
1 stop15h 05m
Delta
Deal found 5/6![Delta logo]()
$879
Last-minute flights from Heathrow to SeattleDiscover last-minute flight deals from Heathrow to Seattle. Data last updated May 9, 2026 and is based on user searches.
Discover last-minute flight deals from Heathrow to Seattle. Data last updated May 9, 2026 and is based on user searches.
This FlightHub deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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.
Wed 5/131:05 pm
LHR
- SEA
1 stop15h 35m
Icelandair
Thu 5/2111:25 pm
SEA
- LHR
1 stop28h 30m
Icelandair
Deal found 5/5![Icelandair logo]()
$728
This Gotogate deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Wed 6/311:25 pm
SEA
- LHR
1 stop28h 30m
Icelandair
Deal found 5/8![Icelandair logo]()
$708
This Icelandair deal was found by Cheapflights users on 5/4. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Mon 6/111:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/4![Icelandair logo]()
$707
This Super.com deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/29:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Tue 6/3011:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/9![Icelandair logo]()
$709
This FlightHub deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/109:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Wed 6/2411:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/7![Icelandair logo]()
$710
This FlightHub deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/129:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Mon 6/2211:25 pm
SEA
- LHR
1 stop28h 30m
Icelandair
Deal found 5/7![Icelandair logo]()
$711
This Kiwi.com deal was found by Cheapflights users on 5/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/159:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Mon 6/2211:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/4![Icelandair logo]()
$705
This FlightHub deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/179:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Fri 7/1711:25 pm
SEA
- LHR
1 stop28h 30m
Icelandair
Deal found 5/9![Icelandair logo]()
$713
This Icelandair deal was found by Cheapflights users on 5/4. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/199:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Wed 6/2411:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/4![Icelandair logo]()
$706
This Gotogate deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/229:25 pm
LHR
- SEA
1 stop31h 15m
Icelandair
Tue 6/3011:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/5![Icelandair logo]()
$733
This Gotogate deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/231:05 pm
LHR
- SEA
1 stop15h 35m
Icelandair
Tue 6/3011:25 pm
SEA
- LHR
1 stop12h 55m
Icelandair
Deal found 5/9![Icelandair logo]()
$714
This FlightHub deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/249:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Fri 7/243:40 pm
SEA
- LHR
1 stop12h 15m
Icelandair
Deal found 5/9![Icelandair logo]()
$712
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 May 9, 2026.
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated May 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2312:00 pm
LHR
- SEA
1 stop13h 10m
Aer Lingus
Deal found 5/7![Aer Lingus logo]()
$549
This oojo deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/241:05 pm
LHR
- SEA
1 stop15h 35m
Icelandair
Deal found 5/7![Icelandair logo]()
$550
This SWISS deal was found by Cheapflights users on 5/4. 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.
Tue 9/16:00 am
LHR
- SEA
2 stops20h 59m
SWISS
Deal found 5/4![SWISS logo]()
$551
This Mytrip deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/51:05 pm
LHR
- SEA
1 stop30h 40m
Icelandair
Deal found 5/9![Icelandair logo]()
$552
This SWISS deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/18:05 pm
LHR
- SEA
2 stops34h 24m
SWISS
Deal found 5/7![SWISS logo]()
$553
This Kiwi.com deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/53:00 pm
LHR
- SEA
3 stops38h 00m
Multiple Airlines
Deal found 5/9![Multiple Airlines logo]()
$554
This Kiwi.com deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/232:10 pm
LHR
- SEA
1 stop27h 30m
WestJet
Deal found 5/8![WestJet logo]()
$555
This Kiwi.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/19:25 pm
LHR
- SEA
2 stops44h 15m
Multiple Airlines
Deal found 5/5![Multiple Airlines logo]()
$556
This Mytrip deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/41:05 pm
LHR
- SEA
1 stop12h 50m
Icelandair
Deal found 5/6![Icelandair logo]()
$557
This Mytrip deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/188:50 pm
LHR
- SEA
2 stops26h 50m
Multiple Airlines
Deal found 5/8![Multiple Airlines logo]()
$558
This United Airlines deal was found by Cheapflights users on 5/4. 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.
Mon 8/314:25 pm
LHR
- SEA
1 stop32h 34m
United Airlines
Deal found 5/4![United Airlines logo]()
$560
This Booking.com deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/239:25 pm
LHR
- SEA
1 stop22h 20m
Icelandair
Deal found 5/7![Icelandair logo]()
$561
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 May 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $705 (Kiwi.com) |
One-way from | $540 (Cheapflightsfares) |
Popular in | July |
Cheapest in | February |
Average price | $826 |
Good round-trip deal | $900 or less |
Good one-way deal | $741 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 2,558,603 searches. Data last updated May 9, 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 - SEA
LHRSEA
London Heathrow
Fri 9/11
1:05 pm-8:40 pm
1 stop15h 35m
Seattle/Tacoma Intl
Mon 9/21
3:40 pm-11:55 am
1 stop12h 15m
$751
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Thu 11/5
2:45 pm-4:50 pm
Nonstop10h 05m
Seattle/Tacoma Intl
Mon 11/9
6:55 pm-12:20 pm
Nonstop9h 25m
$804
Quickest round-trip
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Mon 10/12
9:50 am-11:35 am
Nonstop9h 45m
Seattle/Tacoma Intl
Fri 10/23
1:30 pm-6:45 am
Nonstop9h 15m
$842
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Mon 8/24
7:30 am-4:00 pm
1 stop16h 30m
Seattle/Tacoma Intl
Tue 9/1
1:17 pm-10:30 am
1 stop13h 13m
$844
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sun 10/18
11:40 am-2:00 pm
Nonstop10h 20m
Seattle/Tacoma Intl
Sat 10/24
5:48 pm-11:30 am
Nonstop9h 42m
$863
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Thu 9/3
5:45 pm-8:13 pm
Nonstop10h 28m
Seattle/Tacoma Intl
Thu 9/17
11:50 am-10:40 am
1 stop14h 50m
$873
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sun 6/14
6:30 am-7:05 pm
2 stops20h 35m
Seattle/Tacoma Intl
Mon 6/22
11:59 pm-1:05 pm
1 stop29h 06m
$873
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Fri 9/4
6:30 am-11:47 am
1 stop13h 17m
Seattle/Tacoma Intl
Mon 9/7
9:50 pm-3:35 pm
Nonstop9h 45m
$876
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sat 9/26
3:35 pm-1:45 pm
2 stops30h 10m
Seattle/Tacoma Intl
Thu 10/22
9:50 am-4:00 pm
2 stops22h 10m
$877
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Fri 6/19
11:45 am-11:08 pm
2 stops19h 23m
Seattle/Tacoma Intl
Sun 6/21
8:50 am-7:55 am
1 stop15h 05m
$879
Showing 1-10 of 24 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 May.
| 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*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | 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 80 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of $652). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $938). 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 May 9, 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 10% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 118 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 Friday 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 May 9, 2026.
Get a feel of what it's like to fly with Delta,Virgin Atlantic, andAmerican Airlines 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.
Boarding
8.1
Entertainment
7.8
Crew
8.5
Comfort
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Comfort
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Comfort
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Comfort
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Comfort
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Comfort
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
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
Tacoma
Ocean Shores
Olympia
Lacey
Edmonds
Leavenworth
Snoqualmie
Tumwater
Tukwila
Puyallup
Kent
Lynnwood
Renton
Ellensburg
Fife
Lakewood
Kirkland
Issaquah
Shoreline
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Heathrow and Seattle flights
Browse other Heathrow and Seattle flight options. Last updated on May 9, 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 May 9, 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 May 9, 2026.
Top 5 airlines flying from Heathrow to Seattle
Discover the top 5 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 2,558,603 searches. Data last updated May 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$403 | Average$620 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$574 | Average$894 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$600 | Average$1,009 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$618 | Average$985 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$671 | Average$873 | FlexibilityNo cancel fee | On-time70% |