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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
10 Sep — 17 Sep1
Return
1 adult
Economy
Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or March, booked 90 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday
Cheap flight deals from London to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 5 September 2025.
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 September 2025.
Sat 20/914:10LHR - SEA
1 stop16h 10mMultiple Airlines
Wed 22/1008:00SEA - LHR
1 stop14h 55mMultiple Airlines
Deal found 4/9£462
Sun 5/1020:55LHR - SEA
1 stop22h 55mMultiple Airlines
Mon 20/1017:35SEA - LHR
Nonstop9h 45mMultiple Airlines
Deal found 5/9£463
Thu 11/915:40LGW - SEA
1 stop13h 00mIcelandair
Mon 15/915:45SEA - LGW
1 stop14h 50mIcelandair
Deal found 5/9£464
Tue 9/921:25LHR - SEA
1 stop22h 00mIcelandair
Tue 21/1015:45SEA - LHR
1 stop12h 10mIcelandair
Deal found 4/9£464
Thu 11/918:40LGW - SEA
2 stops31h 56mSWISS
Mon 15/916:25SEA - LGW
1 stop17h 25mSWISS
Deal found 4/9£465
Mon 1/1214:55LHR - SEA
Nonstop10h 00mBritish Airways
Tue 9/1208:30SEA - LHR
1 stop19h 45mBritish Airways
Deal found 3/9£465
Mon 3/1109:00LGW - SEA
2 stops33h 35mMultiple Airlines
Tue 18/1121:34SEA - LGW
1 stop24h 26mMultiple Airlines
Deal found 3/9£466
Wed 17/909:25LCY - SEA
2 stops19h 29mSWISS
Tue 23/914:29SEA - LCY
2 stops19h 01mSWISS
Deal found 4/9£466
Mon 22/911:45LHR - SEA
2 stops19h 58mDelta
Thu 2/1007:25SEA - LHR
2 stops17h 50mDelta
Deal found 4/9£466
Sat 1/1112:20LHR - SEA
Nonstop10h 25mVirgin Atlantic
Thu 6/1116:48SEA - LHR
Nonstop9h 42mVirgin Atlantic
Deal found 4/9£467
Sat 11/1015:40LGW - SEA
1 stop13h 00mIcelandair
Sat 1/1115:35SEA - LGW
1 stop12h 20mIcelandair
Deal found 4/9£467
Sat 20/908:30LHR - SEA
2 stops17h 24mUnited Airlines
Thu 2/1012:00SEA - LHR
1 stop15h 50mUnited Airlines
Deal found 5/9£467
Best flights from London to Seattle
Discover carefully curated flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 September 2025.
Tue 4/1113:25LHR - SEA
2 stops28h 06mAir Canada
Sun 16/1105:50SEA - LHR
2 stops17h 20mAir Canada
Deal found 4/9£462
Mon 22/910:30LHR - SEA
1 stop16h 39mBritish Airways
Thu 23/1007:44SEA - LHR
1 stop14h 41mBritish Airways
Deal found 4/9£462
Wed 17/906:30LHR - SEA
1 stop13h 15mDelta
Wed 1/1006:00SEA - LHR
2 stops17h 15mDelta
Deal found 4/9£462
Sat 20/914:10LHR - SEA
1 stop16h 10mMultiple Airlines
Wed 22/1008:00SEA - LHR
1 stop14h 55mMultiple Airlines
Deal found 4/9£462
Wed 17/911:30LHR - SEA
1 stop14h 10mAir France
Tue 30/920:25SEA - LHR
Nonstop9h 50mAir France
Deal found 5/9£462
Wed 17/909:25LCY - SEA
2 stops19h 29mSWISS
Tue 23/914:29SEA - LCY
2 stops19h 01mSWISS
Deal found 4/9£466
Sat 11/1015:40LGW - SEA
1 stop13h 00mIcelandair
Sat 1/1115:35SEA - LGW
1 stop12h 20mIcelandair
Deal found 4/9£467
Thu 13/1118:15LCY - SEA
1 stop25h 55mLufthansa
Mon 17/1114:00SEA - LCY
1 stop18h 40mLufthansa
Deal found 2/9£474
Tue 16/909:55LHR - SEA
1 stop14h 10mDelta
Thu 2/1007:25SEA - LHR
2 stops17h 50mDelta
Deal found 4/9£462
Sat 20/914:10LHR - SEA
1 stop16h 10mMultiple Airlines
Mon 22/914:00SEA - LHR
1 stop13h 45mMultiple Airlines
Deal found 4/9£462
Tue 2/1209:25LHR - SEA
Nonstop10h 05mBritish Airways
Tue 9/1209:00SEA - LHR
1 stop13h 55mBritish Airways
Deal found 5/9£462
Wed 17/909:25LCY - SEA
2 stops19h 29mSWISS
Wed 24/915:10SEA - LCY
2 stops18h 05mSWISS
Deal found 4/9£466
Direct flights from London to Seattle
Explore direct flight options from London to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 September 2025.
Mon 24/1114:55LHR - SEA
Nonstop10h 00mFinnair
Mon 8/1218:50SEA - LHR
Nonstop9h 30mFinnair
Deal found 5/9£464
Fri 3/1013:25LHR - SEA
Nonstop10h 05mVirgin Atlantic
Tue 7/1020:25SEA - LHR
Nonstop9h 50mVirgin Atlantic
Deal found 2/9£465
Wed 26/1114:55LHR - SEA
Nonstop10h 00mBritish Airways
Tue 2/1218:50SEA - LHR
Nonstop9h 30mBritish Airways
Deal found 4/9£466
Sat 1/1112:20LHR - SEA
Nonstop10h 25mVirgin Atlantic
Thu 6/1116:48SEA - LHR
Nonstop9h 42mVirgin Atlantic
Deal found 4/9£467
Fri 7/1112:20LHR - SEA
Nonstop10h 28mVirgin Atlantic
Tue 11/1119:20SEA - LHR
Nonstop9h 30mVirgin Atlantic
Deal found 4/9£467
Mon 15/917:25LHR - SEA
Nonstop10h 25mAir France
Mon 29/920:25SEA - LHR
Nonstop9h 50mAir France
Deal found 3/9£468
Mon 15/917:25LHR - SEA
Nonstop10h 25mVirgin Atlantic
Mon 29/917:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 4/9£470
Wed 1/1017:25LHR - SEA
Nonstop10h 25mDelta
Thu 9/1020:25SEA - LHR
Nonstop9h 50mDelta
Deal found 4/9£470
Wed 17/917:25LHR - SEA
Nonstop10h 25mDelta
Wed 22/1020:25SEA - LHR
Nonstop9h 50mDelta
Deal found 4/9£471
Mon 2/312:20LHR - SEA
Nonstop10h 25mDelta
Tue 10/317:40SEA - LHR
Nonstop9h 50mDelta
Deal found 3/9£473
Wed 17/917:25LHR - SEA
Nonstop10h 25mVirgin Atlantic
Sun 21/917:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 4/9£473
Mon 15/917:25LHR - SEA
Nonstop10h 25mDelta
Thu 25/920:25SEA - LHR
Nonstop9h 50mDelta
Deal found 4/9£474
Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 5 September 2025 and is based on user searches.
Wed 10/909:30LHR - SEA
1 stop18h 01mAir Canada
Mon 15/910:00SEA - LHR
2 stops17h 50mAir Canada
Deal found 3/9£465
Wed 10/921:25LHR - SEA
1 stop22h 00mIcelandair
Mon 15/915:45SEA - LHR
1 stop20h 35mIcelandair
Deal found 5/9£467
Wed 10/908:30LHR - SEA
2 stops18h 06mMultiple Airlines
Fri 24/1010:00SEA - LHR
1 stop19h 20mMultiple Airlines
Deal found 3/9£468
Wed 10/915:35LGW - SEA
1 stop13h 05mIcelandair
Fri 24/1019:00SEA - LGW
1 stop11h 40mIcelandair
Deal found 3/9£473
Thu 11/915:40LGW - SEA
1 stop13h 00mIcelandair
Mon 15/915:45SEA - LGW
1 stop14h 50mIcelandair
Deal found 5/9£464
Thu 11/918:40LGW - SEA
2 stops31h 56mSWISS
Mon 15/916:25SEA - LGW
1 stop17h 25mSWISS
Deal found 4/9£465
Thu 11/914:10LHR - SEA
1 stop16h 06mAir Canada
Mon 15/919:15SEA - LHR
2 stops41h 45mAir Canada
Deal found 4/9£473
Mon 15/911:25LHR - SEA
1 stop14h 26mUnited Airlines
Mon 29/908:42SEA - LHR
2 stops16h 58mUnited Airlines
Deal found 5/9£462
Mon 15/913:05LHR - SEA
1 stop18h 49mVirgin Atlantic
Mon 29/907:50SEA - LHR
1 stop14h 55mVirgin Atlantic
Deal found 3/9£470
Mon 15/917:25LHR - SEA
Nonstop10h 25mAir France
Tue 23/920:25SEA - LHR
Nonstop9h 50mAir France
Deal found 4/9£470
Sat 11/1015:40LGW - SEA
1 stop13h 00mIcelandair
Sat 1/1115:35SEA - LGW
1 stop12h 20mIcelandair
Deal found 4/9£467
Fri 17/1009:20LGW - SEA
2 stops19h 20mMultiple Airlines
Mon 27/1015:35SEA - LGW
3 stops36h 00mMultiple Airlines
Deal found 4/9£471
One-way flights from London to Seattle
Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated 5 September 2025.
Sat 20/910:45LGW - SEA
2 stops40h 36mWestJet
Deal found 5/9£377
Wed 1/1010:45LGW - SEA
2 stops40h 36mWestJet
Deal found 4/9£378
Sat 20/914:10LHR - SEA
1 stop13h 42mMultiple Airlines
Deal found 3/9£379
Wed 24/921:25LHR - SEA
3 stops31h 12mMultiple Airlines
Deal found 4/9£380
Fri 19/910:45LGW - SEA
2 stops40h 36mWestJet
Deal found 3/9£381
Wed 17/921:25LHR - SEA
2 stops30h 27mMultiple Airlines
Deal found 3/9£381
Fri 19/914:10LHR - SEA
2 stops27h 11mMultiple Airlines
Deal found 3/9£382
Sun 28/914:00LGW - SEA
2 stops37h 36mMultiple Airlines
Deal found 3/9£383
Mon 29/908:30STN - SEA
2 stops19h 59mMultiple Airlines
Deal found 4/9£383
Thu 18/914:10LHR - SEA
1 stop25h 05mMultiple Airlines
Deal found 4/9£383
Thu 18/919:40LGW - SEA
3 stops56h 59mMultiple Airlines
Deal found 4/9£383
Thu 25/910:45LGW - SEA
2 stops30h 37mMultiple Airlines
Deal found 3/9£384
Cheapflights Fare Finder
Customise your flight search to find flights from London to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 5 September 2025.
Use the filters below to find and compare flights from London to Seattle that are best for you.
Fly from
London
Fly to
Seattle
Route
Depart
Return
Price
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Tue 4/11
13:25-09:31
2 stops28h 06m
Seattle/Tacoma Intl
Sun 16/11
05:50-07:10
2 stops17h 20m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Mon 22/9
10:30-19:09
1 stop16h 39m
Seattle/Tacoma Intl
Thu 23/10
07:44-06:25
1 stop14h 41m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 17/9
06:30-11:45
1 stop13h 15m
Seattle/Tacoma Intl
Wed 1/10
06:00-07:15
2 stops17h 15m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sat 20/9
14:10-22:20
1 stop16h 10m
Seattle/Tacoma Intl
Wed 22/10
08:00-06:55
1 stop14h 55m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 17/9
11:30-17:40
1 stop14h 10m
Seattle/Tacoma Intl
Tue 30/9
20:25-14:15
Nonstop9h 50m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Tue 16/9
09:55-16:05
1 stop14h 10m
Seattle/Tacoma Intl
Thu 2/10
07:25-09:15
2 stops17h 50m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sat 20/9
14:10-22:20
1 stop16h 10m
Seattle/Tacoma Intl
Mon 22/9
14:00-11:45
1 stop13h 45m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Tue 2/12
09:25-11:30
Nonstop10h 05m
Seattle/Tacoma Intl
Tue 9/12
09:00-06:55
1 stop13h 55m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Mon 22/9
09:55-16:05
1 stop14h 10m
Seattle/Tacoma Intl
Thu 2/10
07:25-09:15
2 stops17h 50m
£462
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sat 20/9
14:10-22:20
1 stop16h 10m
Seattle/Tacoma Intl
Mon 29/9
08:00-06:55
1 stop14h 55m
£462
Flights are sorted by cheapest return flights first.
Deals found on 5/9
Showing 1-10 of 60 results
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2
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6
Best time to book a flight from London to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.
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 to Seattle
How far ahead should I book a flight from London to Seattle?
Use this chart to determine the optimal time to book a return flight from London to Seattle. Price data was last updated on 29 August 2025.
Booking 90 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from London to Seattle?
Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London to Seattle in July is currently the most expensive (average of £946). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from LON to SEA?
Find hourly flight availability from London to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 September 2025.
Unlike in the afternoon, when flights are generally more expensive, you can save up to 17% on flights from London to Seattle by exploring options for tickets in the evening.
What is the cheapest day to fly from London to Seattle?
Use this chart to determine the cheapest time to fly return from London to Seattle. Price data was last updated on 16 December 2024.
Travellers seeking maximum savings on their London 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 to Seattle
Explore weekly flight availability from London to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 5 September 2025.
The most flights from LON to SEA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 on average).
What’s the top stopover airport for flights from London to Seattle?
Share of one-stop return flights from London to Seattle chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Reykjavik (KEF) – chosen by Cheapflights users on 79% of one-stop itineraries from London to Seattle on Cheapflights.
What’s the cheapest stopover airport for flights from London to Seattle?
Average return fare for one-stop flights from London to Seattle, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Calgary (YYC) is the most affordable one-stop option, with an average return flight price of £412.
What’s the fastest stopover option from London to Seattle?
Shortest average travel time for one-stop one-way flights from London to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Paris (CDG) have the shortest average one-way travel time for one-stop routes: 13h 00m.
Which airport typically offers the quickest stopover for flights from London to Seattle?
Average stopover duration for one-stop one-way flights from London to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Salt Lake City (SLC) offer the fastest connection on this route, with an average stopover time of 0h 52m.
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 5 September 2025.
Read reviews from past customers who have flown with KLM, Air France, andVirgin Atlantic
from London to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Very good and loved being on a smaller plane with only 100 passengers max so boarding and disembarking was quick and easy
Related info for your journey
Find useful and relevant information for your journey from London to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
What airport do you fly into for flights to Seattle from London?
Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 17 daily inbound flights from London from 14 different airlines.
How long is the flight from London to Seattle?
A quick flight from London to Seattle can take about 13h 15m. Air Canada provides one of the quickest options available for as low as £462. There are 4783 mi between London and Seattle. This flight may include one or multiple stops.
What are the cheapest airlines flying from London to Seattle round-trip?
Icelandair, at £325, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Air France and Lufthansa. Icelandair is priced at 41% lower than the current average price of a flight leaving 3 months from now.
What are the most popular routes from London to Seattle?
When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.
What are the most reliable airlines from London to Seattle?
Consider Scandinavian Airlines (93%), KLM (89%) or Air France (89%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.
What are the cheapest flights from London to Seattle?
On average you can expect to pay £1,547 for a flight from London to Seattle. The cheapest flight overall is £478 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £371.
Can I find deals for business class flights from London to Seattle?
Yes. Cheapflights offers flight deals from London 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 to Seattle?
Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London to Seattle in July is currently the most expensive (average of £946). 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
Browse thousands of different options on Cheapflights for your next trip
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Fly from London to Seattle on these airlines
Choose from the following airlines for your flight from London to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 5 September 2025.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 5 September 2025.
Discover the top 10 airlines that operate flights from London to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 5 September 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 London to Seattle?
Cheapflights makes it easy to find London to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.
Why should you use Cheapflights to find cheap flight tickets from London to Seattle?
Millions of users choose and trust Cheapflights to book the best flight deals from London to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from London to Seattle with no change fees?
Certainly. Search results for flights to Seattle from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Can Cheapflights notify me if prices for flights from London to Seattle become cheaper?
Yes, Cheapflights offers price alerts on London to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.
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