This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
20 Oct — 27 Oct1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in February or January, booked 83 days in advance, depart on a Thursday or Wednesday and return on a Wednesday
Cheap flight deals from London to Seattle
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Cheapest flights from London to Seattle
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 20 September 2026.
Tue 29/911:40 -
Nonstop10h 20m
Wed 7/1017:30 -
Nonstop9h 50m
Deal found 18/9£426
Mon 28/910:25 -
1 stop32h 50m
Tue 6/1013:30 -
1 stop18h 30m
Deal found 19/9£428
Sun 27/910:15 -
2 stops16h 17m
Tue 13/1005:50 -
2 stops16h 40m
Deal found 16/9£428
Fri 27/1112:20 -
Nonstop10h 30m
Thu 10/1216:50 -
Nonstop9h 50m
Deal found 19/9£428
Tue 15/1209:30 -
1 stop34h 30m
Thu 7/110:54 -
2 stops16h 26m
Deal found 16/9£429
Thu 15/1015:40 -
1 stop13h 00m
Thu 5/1114:35 -
1 stop12h 20m
Deal found 17/9£430
Thu 24/910:00 -
1 stop14h 35m
Tue 29/913:50 -
1 stop11h 40m
Deal found 17/9£430
Sat 28/1114:30 -
1 stop15h 27m
Thu 10/1212:50 -
1 stop12h 50m
Deal found 19/9£430
Thu 1/1010:25 -
1 stop15h 22m
Mon 30/1115:25 -
1 stop16h 20m
Deal found 18/9£431
Wed 9/1212:20 -
Nonstop10h 30m
Tue 19/123:05 -
1 stop23h 45m
Deal found 17/9£431
Wed 25/1110:00 -
1 stop13h 14m
Sun 6/1215:25 -
1 stop16h 20m
Deal found 19/9£431
Thu 15/1009:20 -
1 stop15h 15m
Thu 22/1013:45 -
1 stop11h 45m
Deal found 17/9£431
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 20 September 2026.
Fri 20/1112:20 -
Nonstop10h 30m
Fri 4/1216:50 -
Nonstop9h 50m
Deal found 19/9£428
Tue 27/1014:45 -
Nonstop10h 20m
Mon 30/1118:45 -
Nonstop9h 35m
Deal found 19/9£429
Sat 31/1012:20 -
Nonstop10h 34m
Sat 7/1116:50 -
Nonstop9h 50m
Deal found 16/9£431
Fri 9/1015:40 -
1 stop13h 00m
Mon 26/1015:35 -
1 stop12h 20m
Deal found 14/9£434
Sat 24/1013:40 -
2 stops32h 59m
Sat 31/1015:15 -
1 stop13h 35m
Deal found 15/9£437
Fri 30/1009:15 -
2 stops21h 03m
Mon 9/1113:16 -
2 stops19h 49m
Deal found 15/9£517
Thu 24/909:25 -
1 stop15h 45m
Thu 1/1019:10 -
1 stop20h 15m
Deal found 17/9£582
Thu 17/1210:25 -
1 stop13h 30m
Mon 11/117:50 -
1 stop17h 35m
Deal found 14/9£617
Sun 22/1117:20 -
2 stops37h 47m
Thu 3/1210:48 -
2 stops39h 07m
Deal found 15/9£738
Sun 18/1018:30 -
Nonstop10h 25m
Sun 25/1017:45 -
Nonstop9h 55m
Deal found 18/9£429
Mon 5/1011:40 -
Nonstop10h 20m
Fri 30/1013:30 -
1 stop13h 30m
Deal found 14/9£434
Sun 27/918:30 -
Nonstop10h 23m
Tue 13/1021:50 -
Nonstop9h 45m
Deal found 17/9£431
Wed 4/1110:00 -
1 stop13h 14m
Sat 14/1111:35 -
2 stops20h 10m
Deal found 15/9£434
Mon 14/1214:45 -
Nonstop10h 05m
Mon 4/118:55 -
Nonstop9h 25m
Deal found 18/9£499
Sat 3/1017:45 -
Nonstop10h 29m
Wed 7/1010:51 -
1 stop17h 24m
Deal found 17/9£434
Tue 20/1020:15 -
1 stop23h 37m
Wed 11/1106:00 -
2 stops18h 50m
Deal found 17/9£447
Fri 11/1211:55 -
1 stop13h 05m
Thu 7/114:35 -
1 stop12h 20m
Deal found 16/9£543
Thu 1/1008:25 -
1 stop16h 10m
Fri 16/1013:45 -
1 stop11h 45m
Deal found 18/9£445
Wed 25/1108:00 -
1 stop17h 00m
Wed 9/1214:35 -
1 stop24h 35m
Deal found 19/9£594
Fri 16/1009:25 -
2 stops21h 31m
Fri 23/1013:19 -
2 stops20h 31m
Deal found 18/9£595
Sun 13/1218:55 -
2 stops28h 34m
Thu 7/114:25 -
1 stop21h 10m
Deal found 16/9£452
Thu 29/1020:05 -
2 stops34h 54m
Mon 9/1115:35 -
2 stops18h 15m
Deal found 15/9£601
Fri 16/1009:15 -
2 stops21h 41m
Fri 23/1007:00 -
2 stops20h 40m
Deal found 15/9£616
Tue 1/1207:05 -
2 stops17h 55m
Thu 10/1214:35 -
2 stops23h 25m
Deal found 16/9£686
Thu 5/1110:55 -
2 stops44h 25m
Thu 19/1119:05 -
1 stop37h 15m
Deal found 15/9£763
Tue 27/1010:25 -
1 stop13h 30m
Mon 30/1117:50 -
1 stop17h 35m
Deal found 19/9£779
Tue 29/910:00 -
1 stop14h 35m
Wed 7/1013:45 -
1 stop11h 45m
Deal found 14/9£557
Wed 4/1110:55 -
2 stops44h 12m
Sat 14/1119:05 -
1 stop30h 50m
Deal found 15/9£773
Fri 9/1008:25 -
1 stop16h 10m
Mon 26/1015:25 -
1 stop21h 10m
Deal found 14/9£590
Sat 31/1007:05 -
1 stop17h 55m
Sun 6/1214:35 -
2 stops13h 45m
Deal found 15/9£723
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 20 September 2026.
Tue 29/911:40 -
Nonstop10h 20m
Wed 7/1017:30 -
Nonstop9h 50m
Deal found 18/9£426
Thu 24/911:40 -
Nonstop10h 20m
Sat 10/1017:30 -
Nonstop9h 50m
Deal found 17/9£428
Mon 23/1112:20 -
Nonstop10h 30m
Thu 10/1216:50 -
Nonstop9h 50m
Deal found 19/9£428
Thu 17/1212:20 -
Nonstop10h 30m
Thu 7/116:55 -
Nonstop9h 45m
Deal found 18/9£429
Mon 5/1017:45 -
Nonstop10h 29m
Thu 15/1021:50 -
Nonstop9h 45m
Deal found 17/9£430
Sun 6/1212:20 -
Nonstop10h 30m
Thu 14/116:55 -
Nonstop9h 45m
Deal found 17/9£431
Sat 31/1012:20 -
Nonstop10h 34m
Tue 10/1116:50 -
Nonstop9h 50m
Deal found 16/9£431
Thu 24/911:40 -
Nonstop10h 20m
Thu 1/1021:50 -
Nonstop9h 45m
Deal found 16/9£432
Sun 1/1114:45 -
Nonstop10h 15m
Sat 5/1218:55 -
Nonstop9h 25m
Deal found 16/9£433
Mon 2/1114:45 -
Nonstop10h 15m
Wed 18/1118:45 -
Nonstop9h 35m
Deal found 15/9£434
Wed 23/917:45 -
Nonstop10h 25m
Fri 2/1021:50 -
Nonstop9h 45m
Deal found 15/9£434
Fri 11/1214:45 -
Nonstop10h 05m
Sat 19/1218:55 -
Nonstop9h 25m
Deal found 15/9£440
Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 20 September 2026 and is based on user searches.
Thu 24/910:00 -
1 stop14h 35m
Tue 29/913:50 -
1 stop11h 40m
Deal found 17/9£430
Thu 24/917:45 -
Nonstop10h 25m
Sat 10/1021:50 -
Nonstop9h 45m
Deal found 17/9£431
Fri 25/911:40 -
Nonstop10h 20m
Sat 10/1021:50 -
Nonstop9h 45m
Deal found 18/9£428
Sun 27/910:15 -
2 stops16h 17m
Tue 13/1005:50 -
2 stops16h 40m
Deal found 16/9£428
Sun 27/915:05 -
1 stop15h 42m
Tue 13/1005:00 -
1 stop20h 40m
Deal found 18/9£429
Mon 28/910:25 -
1 stop32h 50m
Tue 6/1013:30 -
1 stop18h 30m
Deal found 19/9£428
Tue 29/911:40 -
Nonstop10h 20m
Wed 7/1017:30 -
Nonstop9h 50m
Deal found 18/9£426
Thu 1/1010:25 -
1 stop15h 22m
Mon 30/1115:25 -
1 stop16h 20m
Deal found 18/9£431
Fri 9/1010:25 -
1 stop15h 22m
Sun 18/1013:30 -
1 stop11h 55m
Deal found 19/9£431
Thu 15/1015:40 -
1 stop13h 00m
Thu 5/1114:35 -
1 stop12h 20m
Deal found 17/9£430
Thu 15/1009:20 -
1 stop15h 15m
Thu 22/1013:45 -
1 stop11h 45m
Deal found 17/9£431
Mon 26/1012:20 -
Nonstop10h 34m
Tue 1/1206:00 -
1 stop17h 05m
Deal found 19/9£430
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 20 September 2026.
Wed 7/1010:40 -
3 stops59h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£381
Thu 12/1106:30 -
2 stops22h 08m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 14/9£381
Tue 29/913:05 -
1 stop15h 35m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£382
Mon 2/1109:30 -
2 stops22h 01m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£383
Thu 1/1015:40 -
1 stop13h 00m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£384
Sat 12/1214:50 -
1 stop30h 50m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£384
Tue 15/1210:00 -
2 stops18h 42m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£385
Wed 18/1109:15 -
2 stops21h 52m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£385
Sun 6/1215:55 -
3 stops47h 11m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 16/9£387
Sun 13/1207:30 -
2 stops20h 50m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 16/9£387
Tue 17/1116:45 -
1 stop30h 29m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 19/9£387
Tue 15/1212:20 -
Nonstop10h 30m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 17/9£387
Find 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 20 September 2026.
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 7,457,451 searches. Data last updated 20 September 2026.
Use the filters below to find and compare flights from London 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
Mon 2/11
09:30-23:31
2 stops22h 01m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£383
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Tue 15/12
10:00-20:42
2 stops18h 42m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£385
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Tue 17/11
16:45-15:14
1 stop30h 29m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£387
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Fri 20/11
12:20-14:50
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£387
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 19/11
12:20-14:50
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£387
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Tue 15/12
12:20-14:50
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£390
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Sun 13/12
12:20-14:50
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£390
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 18/11
12:20-14:50
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£390
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Mon 14/12
12:20-14:50
Nonstop10h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£390
Fastest return journey
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 16/12
14:45-16:50
Nonstop10h 05m
Seattle/Tacoma Intl
Wed 31/12
00:00-09:00
Nonstop0h 00m
£392
Flights are sorted by cheapest return flights first.
Deals found on 15/9
Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
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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.
LON-SEA
LHR-SEA
LGW-SEA
LCY-SEA
LTN-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 to Seattle
LON-SEA
LHR-SEA
LGW-SEA
LCY-SEA
LTN-SEA
What is the cheapest month to book a flight from London to Seattle?
Currently, February is the cheapest month in which you can book a flight from London to Seattle (average of £481). Flying from London to Seattle in July is currently the most expensive (average of £640). 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 20 September 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Seattle as you normally would.
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 20 September 2026.
The most flights from LON to SEA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 on average).
How much does it cost for a return flight from London to Seattle?
Airfare is below average for this route at the moment.
London to Seattle flights typically cost between £475 and £627 in December.The cheapest return price found within the last 5 days was £428 on Virgin Atlantic (23 Dec–6 Jan).
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 73% 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.
Zurich (ZRH) is the most affordable one-stop option, with an average return flight price of £454.
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 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 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 Denver (DEN) offer the fastest connection on this route, with an average stopover time of 1h 18m.
How often are flights from London to Seattle delayed?
About 11% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 130 minutes.
What is the most punctual flight time for London to Seattle flights?
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Sunday tends to have the lowest number of delays on this route, whereas Tuesday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on London to Seattle flights?
Over the past year, Delta have had the lowest number of delays on this route, with just 5% of flights being delayed.
How far ahead should I book a flight from London to Seattle?
Booking 73 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.
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 20 September 2026.
Read reviews from past customers who have flown with Alaska Airlines,KLM, 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.
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 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 23 daily inbound flights from London from 12 different airlines.
How long is the flight from London to Seattle?
A quick flight from London to Seattle can take about 10h 20m. Delta provides one of the quickest options available for as low as £429. There are 4783 mi between London and Seattle. All flights are typically direct.
What are the cheapest airlines flying from London to Seattle round-trip?
Lufthansa, at £335, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Icelandair and United Airlines. Lufthansa is priced at 40% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London to Seattle one-way?
£336 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Icelandair and KLM, with prices starting from £340 and £347, respectively.
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 (82%), KLM (81%) or SAUDIA (81%) 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 £1,834 for a flight from London to Seattle. The cheapest flight overall is £317 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £265.
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, February is the cheapest month in which you can book a flight from London to Seattle (average of £481). Flying from London to Seattle in July is currently the most expensive (average of £640). 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
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 20 September 2026.
Browse through other flights departing from London. Flights are based on user searches made on Cheapflights and were last updated on 20 September 2026.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 20 September 2026.
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 7,457,451 searches. Data last updated 20 September 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 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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