Cheap flights from London Heathrow Airport to Seattle from £386
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
10 Dec — 17 Dec1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
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 Thursday or Wednesday and return on a Saturday
Cheap flight deals from Heathrow to Seattle
Enter your travel dates to find the best prices.
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Cheapest flights from Heathrow to Seattle
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 10 November 2026.
Thu 10/1209:25 -
Nonstop10h 00m
Fri 25/1218:45 -
Nonstop9h 25m
Deal found 5/11£407
Thu 10/1209:25 -
Nonstop10h 00m
Thu 24/1213:40 -
Nonstop9h 30m
Deal found 8/11£409
Thu 3/1214:45 -
Nonstop10h 15m
Thu 10/1218:45 -
Nonstop9h 35m
Deal found 9/11£415
Fri 20/1106:30 -
1 stop13h 17m
Sat 28/1116:50 -
Nonstop9h 50m
Deal found 5/11£416
Tue 24/1114:45 -
Nonstop10h 15m
Thu 3/1218:45 -
Nonstop9h 35m
Deal found 9/11£417
Wed 25/1107:40 -
1 stop13h 20m
Wed 2/1215:15 -
1 stop12h 35m
Deal found 5/11£418
Fri 25/1212:15 -
1 stop12h 45m
Tue 29/1214:35 -
1 stop12h 15m
Deal found 5/11£418
Thu 3/1213:50 -
1 stop16h 48m
Mon 7/1218:45 -
Nonstop9h 25m
Deal found 7/11£419
Tue 24/1108:20 -
1 stop16h 39m
Thu 3/1210:52 -
1 stop13h 43m
Deal found 9/11£421
Thu 10/1216:30 -
1 stop16h 17m
Mon 14/1209:15 -
1 stop13h 20m
Deal found 9/11£421
Tue 24/1108:20 -
1 stop16h 39m
Tue 1/1210:33 -
1 stop14h 02m
Deal found 8/11£422
Thu 24/1213:50 -
1 stop17h 18m
Fri 8/109:58 -
1 stop14h 37m
Deal found 9/11£423
Best flights from Heathrow to Seattle
Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 10 November 2026.
Tue 17/1106:30 -
1 stop13h 17m
Tue 1/1216:50 -
Nonstop9h 50m
Deal found 7/11£436
Sat 5/1206:20 -
1 stop15h 30m
Wed 9/1216:50 -
Nonstop9h 50m
Deal found 5/11£439
Thu 19/1106:30 -
1 stop13h 17m
Thu 3/1216:50 -
Nonstop9h 50m
Deal found 8/11£449
Sun 7/214:45 -
Nonstop10h 05m
Mon 15/218:40 -
Nonstop9h 40m
Deal found 5/11£453
Sat 23/114:55 -
Nonstop9h 55m
Sat 13/206:13 -
1 stop18h 22m
Deal found 7/11£457
Tue 17/1106:50 -
2 stops20h 13m
Tue 1/1207:00 -
2 stops15h 40m
Deal found 7/11£474
Sat 21/1112:20 -
Nonstop10h 30m
Thu 26/1107:38 -
1 stop15h 12m
Deal found 5/11£450
Mon 16/1111:20 -
1 stop31h 49m
Sun 29/1115:25 -
1 stop14h 20m
Deal found 8/11£479
Sat 26/1212:05 -
1 stop16h 57m
Wed 6/105:00 -
2 stops16h 55m
Deal found 9/11£497
Mon 16/1112:20 -
Nonstop10h 30m
Sat 21/1123:47 -
1 stop23h 18m
Deal found 9/11£489
Mon 21/1207:50 -
2 stops21h 35m
Fri 8/108:30 -
1 stop17h 10m
Deal found 5/11£501
Direct flights from Heathrow to Seattle
Explore direct flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 10 November 2026.
Thu 10/1209:25 -
Nonstop10h 00m
Fri 25/1218:45 -
Nonstop9h 25m
Deal found 5/11£407
Thu 10/1209:25 -
Nonstop10h 00m
Thu 24/1213:40 -
Nonstop9h 30m
Deal found 8/11£409
Thu 3/1214:45 -
Nonstop10h 15m
Thu 10/1218:45 -
Nonstop9h 35m
Deal found 9/11£415
Tue 24/1114:45 -
Nonstop10h 15m
Thu 3/1218:45 -
Nonstop9h 35m
Deal found 9/11£417
Thu 10/1209:25 -
Nonstop10h 00m
Fri 25/1218:45 -
Nonstop9h 25m
Deal found 8/11£418
Thu 10/1214:45 -
Nonstop10h 15m
Thu 24/1218:45 -
Nonstop9h 35m
Deal found 7/11£421
Wed 20/114:45 -
Nonstop10h 05m
Sun 24/118:40 -
Nonstop9h 40m
Deal found 9/11£424
Tue 17/1114:45 -
Nonstop10h 15m
Thu 26/1118:45 -
Nonstop9h 35m
Deal found 6/11£424
Thu 10/1209:25 -
Nonstop10h 00m
Thu 24/1213:40 -
Nonstop9h 30m
Deal found 7/11£426
Thu 3/1214:45 -
Nonstop10h 15m
Tue 8/1218:45 -
Nonstop9h 35m
Deal found 5/11£427
Thu 10/1209:25 -
Nonstop10h 00m
Thu 24/1213:40 -
Nonstop9h 30m
Deal found 9/11£427
Fri 20/1114:45 -
Nonstop10h 15m
Sat 28/1118:45 -
Nonstop9h 35m
Deal found 5/11£428
Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 10 November 2026 and is based on user searches.
Fri 20/1106:30 -
1 stop13h 17m
Sat 28/1116:50 -
Nonstop9h 50m
Deal found 5/11£416
Tue 24/1114:45 -
Nonstop10h 15m
Thu 3/1218:45 -
Nonstop9h 35m
Deal found 9/11£417
Tue 24/1108:20 -
1 stop16h 39m
Thu 3/1210:52 -
1 stop13h 43m
Deal found 9/11£421
Tue 24/1108:20 -
1 stop16h 39m
Tue 1/1213:30 -
Nonstop9h 30m
Deal found 8/11£422
Wed 25/1107:40 -
1 stop13h 20m
Wed 2/1215:15 -
1 stop12h 35m
Deal found 5/11£418
Thu 3/1214:45 -
Nonstop10h 15m
Thu 10/1218:45 -
Nonstop9h 35m
Deal found 9/11£415
Thu 3/1213:50 -
1 stop16h 48m
Mon 7/1218:45 -
Nonstop9h 25m
Deal found 7/11£419
Thu 10/1209:25 -
Nonstop10h 00m
Fri 25/1218:45 -
Nonstop9h 25m
Deal found 5/11£407
Thu 10/1209:25 -
Nonstop10h 00m
Thu 24/1213:40 -
Nonstop9h 30m
Deal found 8/11£409
Thu 10/1216:30 -
1 stop16h 17m
Mon 14/1209:15 -
1 stop13h 20m
Deal found 9/11£421
Thu 24/1213:50 -
1 stop17h 18m
Fri 8/109:58 -
1 stop14h 37m
Deal found 9/11£423
Fri 25/1212:15 -
1 stop12h 45m
Tue 29/1214:35 -
1 stop12h 15m
Deal found 5/11£418
One-way flights from Heathrow to Seattle
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated 10 November 2026.
Tue 1/1220:35 -
1 stop28h 25m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 7/11£386
Thu 3/1216:20 -
3 stops32h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 10/11£387
Thu 14/120:50 -
3 stops52h 10m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 6/11£388
Sat 16/112:15 -
1 stop12h 45m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 7/11£389
Wed 27/109:00 -
2 stops19h 59m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 8/11£390
Sun 6/1209:55 -
3 stops42h 09m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 5/11£391
Wed 27/109:00 -
2 stops21h 57m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 9/11£393
Tue 12/120:05 -
2 stops34h 52m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 7/11£394
Wed 9/1206:40 -
2 stops18h 20m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 8/11£395
Tue 19/114:45 -
Nonstop10h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 5/11£395
Sun 17/114:45 -
Nonstop10h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 9/11£397
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 10 November 2026.
Customise 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 10 November 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
Price
Cheapest return flight
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 22/1
06:30-11:50
1 stop13h 20m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£394
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 14/1
11:45-22:02
2 stops18h 17m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£398
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 13/1
11:45-10:58
2 stops55h 13m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£398
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 11/1
07:30-19:38
2 stops20h 08m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£398
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 15/1
06:30-16:02
2 stops17h 32m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£398
Fastest return journey
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 11/1
12:20-14:45
Nonstop10h 25m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£410
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 6/1
10:45-00:23
1 stop21h 38m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£418
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 17/11
06:30-11:47
1 stop13h 17m
Seattle/Tacoma Intl
Tue 1/12
16:50-10:40
Nonstop9h 50m
£436
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 15/12
09:00-23:44
2 stops22h 44m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£438
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sat 5/12
06:20-13:50
1 stop15h 30m
Seattle/Tacoma Intl
Wed 9/12
16:50-10:40
Nonstop9h 50m
£439
Flights are sorted by cheapest return flights first.
Deals found on 6/11
Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3
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 return 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
More
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 £476). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £667). 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 10 November 2026.
When flying from London Heathrow Airport 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.
How much does it cost for a return flight from London Heathrow Airport to Seattle?
Airfare is below average for this route at the moment.
London Heathrow Airport to Seattle flights typically cost between £428 and £619 in December.The cheapest return price found within the last 5 days was £407 on Multiple Airlines (10 Dec–25 Dec).
Weekly flight availability from London Heathrow Airport to Seattle
Explore weekly flight availability from Heathrow 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 10 November 2026.
The most flights from LHR to SEA are scheduled on a Thursday (19 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (13 on average).
How often are flights from London to Seattle delayed?
About 12% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 134 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?
Sunday 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 past year, Delta have had the lowest number of delays on this route, with just 5% of flights being delayed.
What’s the top stopover airport for flights from London Heathrow Airport to Seattle?
Share of one-stop return flights from London Heathrow Airport to Seattle chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Reykjavik (KEF) – chosen by Cheapflights users on 74% of one-stop itineraries from London Heathrow Airport to Seattle on Cheapflights.
What’s the cheapest stopover airport for flights from London Heathrow Airport to Seattle?
Average return fare for one-stop flights from London Heathrow Airport to Seattle, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Dallas (DFW) is the most affordable one-stop option, with an average return flight price of £475.
What’s the fastest stopover option from London Heathrow Airport to Seattle?
Shortest average travel time for one-stop one-way flights from London Heathrow Airport to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Vancouver (YVR) have the shortest average one-way travel time for one-stop routes: 12h 46m.
Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Seattle?
Average stopover duration for one-stop one-way flights from London Heathrow Airport to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Dallas (DFW) offer the fastest connection on this route, with an average stopover time of 1h 40m.
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 10 November 2026.
See what other customers who have flown with Alaska Airlines,KLM, andVirgin Atlantic from London Heathrow Airport 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.
It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
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.
What airport do you fly into for flights to Seattle from London Heathrow?
If you book a flight to Seattle from London Heathrow, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 15 flights from London Heathrow to Seattle/Tacoma Intl per day from 12 different airlines.
How long is the flight from London Heathrow Airport to Seattle?
Departing from London Heathrow Airport to Seattle will take you 10h 05m. The distance from London Heathrow Airport to Seattle is about 4783 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
According to our current data, Icelandair (£325), Lufthansa (£335), and United Airlines (£370) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 44% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?
The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as £336. However, be on the lookout for offers from Icelandair and Virgin Atlantic, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.
What are the most reliable airlines from London Heathrow Airport to Seattle?
Consider Scandinavian Airlines (85%), KLM (84%) or SAUDIA (84%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.
What are the cheapest flights from London Heathrow Airport to Seattle?
The cheapest flight price from London Heathrow Airport to Seattle is £353. On average you can expect to pay £1,878. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £257.
Can I find deals for business class flights from Heathrow to Seattle?
Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
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 £476). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £667). 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.
Book flights to Seattle if you plan to visit one of these locations
Federal Way
SeaTac
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Fly from Heathrow to Seattle on these airlines
Choose from the following airlines for your flight from Heathrow to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 10 November 2026.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 10 November 2026.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 10 November 2026.
Discover the top 10 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 10 November 2026.
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Heathrow to Seattle?
Deals for Heathrow to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Heathrow to Seattle?
Cheapflights helps you find that perfect flight to Seattle from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!
Can Cheapflights find flights from Heathrow to Seattle with no change fees?
Need flexible booking options for your flight to Seattle from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.
Can Cheapflights notify me if prices for flights from Heathrow to Seattle become cheaper?
Yes! Start tracking prices for Heathrow to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.
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