Cheap flights from London Heathrow Airport to Seattle from £414
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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
27 Dec — 3 Jan1
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 February or September, booked 62 days in advance, depart on a Wednesday or Thursday and return on a Tuesday
Cheap 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 27 November 2025.
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 27 November 2025.
Wed 10/1212:15LHR - SEA
1 stop12h 45mIcelandair
Mon 5/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 24/11£477
Tue 2/1215:35LHR - SEA
2 stops51h 00mFinnair
Sat 6/1222:59SEA - LHR
1 stop24h 51mFinnair
Deal found 25/11£489
Wed 24/1216:30LHR - SEA
1 stop26h 29mAmerican Airlines
Sun 28/1223:07SEA - LHR
1 stop24h 43mAmerican Airlines
Deal found 24/11£489
Mon 29/1206:30LHR - SEA
1 stop13h 20mDelta
Thu 8/116:45SEA - LHR
Nonstop9h 45mDelta
Deal found 26/11£491
Sun 14/1216:55LHR - SEA
1 stop33h 25mFinnair
Tue 6/111:25SEA - LHR
2 stops35h 45mFinnair
Deal found 26/11£494
Wed 31/1209:25LHR - SEA
1 stop19h 18mDelta
Thu 8/106:05SEA - LHR
1 stop17h 00mDelta
Deal found 26/11£495
Wed 24/1206:20LHR - SEA
1 stop15h 05mDelta
Fri 9/108:15SEA - LHR
1 stop14h 10mDelta
Deal found 26/11£496
Tue 16/1220:45LHR - SEA
1 stop29h 35mBritish Airways
Wed 14/118:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 26/11£497
Tue 30/1206:30LHR - SEA
1 stop13h 20mDelta
Fri 9/107:40SEA - LHR
1 stop15h 10mDelta
Deal found 26/11£499
Tue 16/1220:45LHR - SEA
1 stop29h 35mBritish Airways
Thu 15/106:12SEA - LHR
1 stop16h 23mBritish Airways
Deal found 25/11£501
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 27 November 2025.
Fri 13/214:55LHR - SEA
Nonstop10h 00mBritish Airways
Thu 19/210:30SEA - LHR
1 stop13h 45mBritish Airways
Deal found 25/11£484
Sun 8/212:20LHR - SEA
Nonstop10h 25mDelta
Wed 4/316:45SEA - LHR
Nonstop9h 45mDelta
Deal found 25/11£484
Thu 15/114:55LHR - SEA
Nonstop10h 00mFinnair
Wed 28/108:35SEA - LHR
1 stop14h 15mFinnair
Deal found 24/11£489
Mon 18/516:30LHR - SEA
Nonstop9h 55mBritish Airways
Thu 21/513:35SEA - LHR
Nonstop9h 15mBritish Airways
Deal found 26/11£486
Sun 15/306:30LHR - SEA
1 stop13h 05mDelta
Tue 24/307:20SEA - LHR
1 stop16h 00mDelta
Deal found 26/11£516
Sat 7/214:55LHR - SEA
Nonstop10h 00mBritish Airways
Tue 3/318:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 25/11£497
Sat 7/209:25LHR - SEA
Nonstop10h 05mBritish Airways
Thu 26/218:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 25/11£497
Mon 9/214:55LHR - SEA
Nonstop10h 00mBritish Airways
Sat 28/218:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 25/11£497
Wed 11/214:55LHR - SEA
Nonstop10h 00mBritish Airways
Sat 28/218:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 25/11£497
Wed 20/509:50LHR - SEA
Nonstop9h 45mBritish Airways
Sat 23/513:35SEA - LHR
Nonstop9h 15mBritish Airways
Deal found 26/11£523
Sun 8/214:55LHR - SEA
Nonstop10h 00mBritish Airways
Sat 28/213:35SEA - LHR
Nonstop9h 35mBritish Airways
Deal found 25/11£526
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 27 November 2025.
Tue 7/416:30LHR - SEA
Nonstop9h 55mBritish Airways
Fri 8/513:35SEA - LHR
Nonstop9h 15mBritish Airways
Deal found 25/11£481
Sat 7/212:20LHR - SEA
Nonstop10h 25mDelta
Wed 4/316:45SEA - LHR
Nonstop9h 45mDelta
Deal found 25/11£484
Tue 7/416:30LHR - SEA
Nonstop9h 55mBritish Airways
Thu 23/420:20SEA - LHR
Nonstop9h 25mBritish Airways
Deal found 25/11£485
Fri 16/109:25LHR - SEA
Nonstop10h 05mBritish Airways
Tue 20/113:25SEA - LHR
Nonstop9h 35mBritish Airways
Deal found 23/11£486
Mon 9/214:55LHR - SEA
Nonstop10h 00mBritish Airways
Sun 1/318:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 26/11£486
Sat 24/112:20LHR - SEA
Nonstop10h 29mAir France
Sun 1/216:55SEA - LHR
Nonstop9h 35mAir France
Deal found 25/11£487
Thu 12/214:55LHR - SEA
Nonstop10h 00mFinnair
Mon 23/218:50SEA - LHR
Nonstop9h 30mFinnair
Deal found 25/11£488
Thu 15/114:55LHR - SEA
Nonstop10h 00mFinnair
Wed 28/118:50SEA - LHR
Nonstop9h 30mFinnair
Deal found 24/11£489
Thu 15/114:55LHR - SEA
Nonstop10h 00mBritish Airways
Tue 20/118:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 23/11£489
Mon 18/509:50LHR - SEA
Nonstop9h 45mBritish Airways
Wed 3/613:35SEA - LHR
Nonstop9h 15mBritish Airways
Deal found 25/11£491
Mon 18/509:50LHR - SEA
Nonstop9h 45mAmerican Airlines
Mon 25/520:20SEA - LHR
Nonstop9h 25mAmerican Airlines
Deal found 26/11£493
Wed 7/112:20LHR - SEA
Nonstop10h 29mAir France
Fri 16/116:45SEA - LHR
Nonstop9h 45mAir France
Deal found 26/11£494
Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 27 November 2025 and is based on user searches.
Tue 2/1215:35LHR - SEA
2 stops51h 00mFinnair
Sat 6/1222:59SEA - LHR
1 stop24h 51mFinnair
Deal found 25/11£489
Wed 10/1212:15LHR - SEA
1 stop12h 45mIcelandair
Mon 5/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 24/11£477
Sun 14/1216:55LHR - SEA
1 stop33h 25mFinnair
Tue 6/111:25SEA - LHR
2 stops35h 45mFinnair
Deal found 26/11£494
Tue 16/1220:45LHR - SEA
1 stop29h 35mBritish Airways
Wed 14/118:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 26/11£497
Tue 16/1220:45LHR - SEA
1 stop29h 35mBritish Airways
Thu 15/114:04SEA - LHR
1 stop13h 31mBritish Airways
Deal found 26/11£500
Wed 24/1216:30LHR - SEA
1 stop26h 29mAmerican Airlines
Sun 28/1223:07SEA - LHR
1 stop24h 43mAmerican Airlines
Deal found 24/11£489
Wed 24/1206:20LHR - SEA
1 stop15h 05mDelta
Fri 9/108:15SEA - LHR
1 stop14h 10mDelta
Deal found 26/11£496
Mon 29/1206:30LHR - SEA
1 stop13h 20mDelta
Thu 8/116:45SEA - LHR
Nonstop9h 45mDelta
Deal found 26/11£491
Tue 30/1206:30LHR - SEA
1 stop13h 20mDelta
Sat 10/106:05SEA - LHR
1 stop17h 00mDelta
Deal found 26/11£499
Wed 31/1209:25LHR - SEA
1 stop19h 18mDelta
Thu 8/106:05SEA - LHR
1 stop17h 00mDelta
Deal found 26/11£495
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 27 November 2025.
Sat 10/111:10LHR - SEA
1 stop19h 06mAir Canada
Deal found 26/11£414
Sat 21/209:25LHR - SEA
Nonstop10h 05mBritish Airways
Deal found 24/11£416
Thu 22/114:55LHR - SEA
Nonstop10h 00mBritish Airways
Deal found 26/11£417
Sat 4/415:10LHR - SEA
1 stop33h 49mAer Lingus
Deal found 24/11£417
Wed 10/1213:40LHR - SEA
3 stops34h 50mMultiple Airlines
Deal found 24/11£418
Fri 5/1214:50LHR - SEA
3 stops27h 32mMultiple Airlines
Deal found 26/11£419
Sat 2/509:50LHR - SEA
Nonstop9h 45mFinnair
Deal found 26/11£421
Wed 3/1214:50LHR - SEA
2 stops51h 32mWestJet
Deal found 26/11£422
Fri 26/1208:50LHR - SEA
1 stop17h 30mAer Lingus
Deal found 26/11£426
Sun 14/1207:50LHR - SEA
1 stop18h 30mAer Lingus
Deal found 26/11£427
Cheapflights Fare Finder
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 858,174 searches. Data last updated 27 November 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.
Fly from
Heathrow
Fly to
Seattle
Route
Depart
Return
Price
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Fri 13/2
14:55-16:55
Nonstop10h 00m
Seattle/Tacoma Intl
Thu 19/2
10:30-08:15
1 stop13h 45m
£484
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sun 8/2
12:20-14:45
Nonstop10h 25m
Seattle/Tacoma Intl
Wed 4/3
16:45-10:30
Nonstop9h 45m
£484
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Mon 18/5
16:30-18:25
Nonstop9h 55m
Seattle/Tacoma Intl
Thu 21/5
13:35-06:50
Nonstop9h 15m
£486
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Thu 15/1
14:55-16:55
Nonstop10h 00m
Seattle/Tacoma Intl
Wed 28/1
08:35-06:50
1 stop14h 15m
£489
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sat 7/2
14:55-16:55
Nonstop10h 00m
Seattle/Tacoma Intl
Tue 3/3
18:50-12:20
Nonstop9h 30m
£497
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sat 7/2
09:25-11:30
Nonstop10h 05m
Seattle/Tacoma Intl
Thu 26/2
18:50-12:20
Nonstop9h 30m
£497
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Mon 9/2
14:55-16:55
Nonstop10h 00m
Seattle/Tacoma Intl
Sat 28/2
18:50-12:20
Nonstop9h 30m
£497
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 11/2
14:55-16:55
Nonstop10h 00m
Seattle/Tacoma Intl
Sat 28/2
18:50-12:20
Nonstop9h 30m
£497
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sun 15/3
06:30-12:35
1 stop13h 05m
Seattle/Tacoma Intl
Tue 24/3
07:20-06:20
1 stop16h 00m
£516
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 20/5
09:50-11:35
Nonstop9h 45m
Seattle/Tacoma Intl
Sat 23/5
13:35-06:50
Nonstop9h 15m
£523
Flights are sorted by cheapest return flights first.
Deals found on 24/11
Showing 1-10 of 20 results
1
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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.
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?
Use this chart to determine the optimal time to book a return flight from Heathrow to Seattle. Price data was last updated on 21 November 2025.
The best time to book flights from London Heathrow Airport to Seattle is 62 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 £383). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £517). 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 27 November 2025.
It’s typically best to fly out from London Heathrow Airport to Seattle in the evening. Doing so could potentially save you 16% on the flight price compared to flying in the morning, which is usually more expensive.
What is the cheapest day to fly from London Heathrow Airport to Seattle?
Use this chart to determine the cheapest time to fly return from Heathrow to Seattle. Price data was last updated on 25 November 2025.
Travellers seeking maximum savings on their London Heathrow Airport to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.
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 27 November 2025.
The most flights from LHR to SEA are scheduled on a Monday (15 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 on average).
How often are flights from London to Seattle delayed?
About 13% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 117 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?
Tuesday tends to have the lowest number of delays on this route, whereas Wednesday 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 6% 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 61% 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.
Zurich (ZRH) is the most affordable one-stop option, with an average return flight price of £442.
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 Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 13h 13m.
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 Helsinki (HEL) offer the fastest connection on this route, with an average stopover time of 1h 17m.
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 27 November 2025.
See what other customers who have flown with KLM, Virgin Atlantic, andAir France 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.
The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
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 12 flights from London Heathrow to Seattle/Tacoma Intl per day from 14 different airlines.
How long is the flight from London Heathrow Airport to Seattle?
Departing from London Heathrow Airport to Seattle will take you 10h. The distance from London Heathrow Airport to Seattle is about 4783 mi. All flights are typically direct.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
According to our current data, Icelandair (£362), Air France (£391), and Finnair (£403) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 38% lower than the current average price of a flight leaving 3 months from now.
What are the most reliable airlines from London Heathrow Airport to Seattle?
Consider Scandinavian Airlines (95%), Air France (86%) or KLM (85%) 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 £377. On average you can expect to pay £1,725. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £386.
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 £383). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £517). 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
Tacoma
Leavenworth
Bothell
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 27 November 2025.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 27 November 2025.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 27 November 2025.
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 858,174 searches. Data last updated 27 November 2025.
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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