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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
29 Sep — 6 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 84 days in advance, depart on a Thursday or Wednesday and return on a Tuesday
Cheap flight deals from London to Seattle
Enter your travel dates to find the best prices.
Cheapest
Best
Direct
Last-minute
One-way
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 30 August 2026.
Tue 13/1007:05 -
2 stops21h 35m
Tue 20/1019:00 -
3 stops30h 20m
Deal found 29/8£516
Thu 1/1014:05 -
2 stops16h 42m
Thu 8/1005:50 -
2 stops16h 45m
Deal found 25/8£516
Fri 9/1019:55 -
2 stops25h 50m
Fri 16/1019:00 -
1 stop11h 40m
Deal found 25/8£517
Thu 29/1011:10 -
2 stops19h 07m
Thu 5/1108:40 -
2 stops18h 40m
Deal found 28/8£517
Thu 1/1019:55 -
2 stops25h 50m
Wed 28/1015:35 -
1 stop12h 20m
Deal found 29/8£518
Fri 25/906:50 -
2 stops17h 18m
Sat 3/1019:25 -
2 stops17h 55m
Deal found 28/8£518
Wed 2/911:50 -
1 stop12h 50m
Wed 16/917:35 -
Nonstop9h 50m
Deal found 26/8£519
Thu 1/1019:55 -
2 stops25h 50m
Thu 29/1015:35 -
2 stops20h 15m
Deal found 27/8£519
Thu 1/1016:55 -
2 stops28h 50m
Thu 8/1019:00 -
2 stops19h 35m
Deal found 28/8£519
Mon 12/1014:10 -
1 stop14h 54m
Sun 1/1119:35 -
2 stops28h 55m
Deal found 26/8£519
Mon 7/910:25 -
2 stops21h 29m
Tue 15/923:08 -
2 stops26h 17m
Deal found 29/8£520
Sat 10/1020:10 -
2 stops25h 35m
Sat 17/1015:40 -
2 stops24h 25m
Deal found 26/8£520
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 30 August 2026.
Tue 27/1009:25 -
Nonstop10h 00m
Sun 8/1107:30 -
1 stop15h 20m
Deal found 26/8£520
Wed 28/1020:05 -
2 stops34h 13m
Wed 4/1115:35 -
2 stops18h 15m
Deal found 28/8£531
Thu 24/917:45 -
Nonstop10h 25m
Fri 2/1017:30 -
Nonstop9h 50m
Deal found 26/8£554
Fri 18/909:20 -
1 stop15h 15m
Tue 22/917:45 -
1 stop14h 55m
Deal found 29/8£576
Mon 9/1110:00 -
1 stop13h 14m
Fri 13/1106:00 -
2 stops19h 00m
Deal found 26/8£578
Sun 20/906:50 -
2 stops21h 28m
Thu 7/113:16 -
2 stops16h 14m
Deal found 28/8£608
Thu 17/917:00 -
Nonstop10h 00m
Sat 26/921:40 -
Nonstop9h 25m
Deal found 25/8£646
Mon 26/1010:25 -
1 stop13h 30m
Sun 8/1116:15 -
1 stop14h 45m
Deal found 28/8£649
Thu 24/910:20 -
1 stop13h 40m
Mon 28/909:57 -
2 stops24h 53m
Deal found 28/8£654
Thu 18/210:55 -
2 stops43h 34m
Wed 3/311:00 -
2 stops38h 55m
Deal found 29/8£724
Tue 27/1011:55 -
1 stop13h 05m
Sun 8/1111:26 -
2 stops15h 29m
Deal found 27/8£780
Wed 28/1006:00 -
2 stops24h 17m
Fri 6/1113:16 -
2 stops20h 34m
Deal found 28/8£531
Thu 24/910:00 -
1 stop14h 35m
Fri 2/1013:45 -
1 stop11h 45m
Deal found 26/8£570
Mon 23/1118:55 -
1 stop24h 52m
Mon 30/1114:35 -
1 stop21h 00m
Deal found 26/8£586
Wed 7/1009:15 -
2 stops17h 17m
Wed 14/1015:18 -
2 stops18h 07m
Deal found 25/8£544
Sat 17/1009:50 -
Nonstop9h 45m
Sat 24/1012:04 -
1 stop17h 11m
Deal found 26/8£610
Sat 10/1010:25 -
1 stop15h 22m
Sat 17/1013:30 -
1 stop11h 50m
Deal found 25/8£619
Mon 4/120:05 -
2 stops28h 54m
Mon 18/106:00 -
2 stops17h 15m
Deal found 27/8£604
Sat 31/1020:15 -
1 stop25h 40m
Tue 3/1117:50 -
1 stop13h 10m
Deal found 28/8£664
Tue 22/1207:00 -
1 stop18h 00m
Sun 3/114:35 -
1 stop23h 55m
Deal found 28/8£670
Fri 30/1009:15 -
2 stops21h 03m
Thu 5/1113:16 -
2 stops19h 49m
Deal found 28/8£581
Thu 18/206:30 -
1 stop18h 40m
Wed 3/319:05 -
1 stop30h 05m
Deal found 26/8£748
Fri 2/1006:20 -
2 stops35h 20m
Mon 5/1015:40 -
2 stops23h 10m
Deal found 29/8£725
Sun 6/1219:05 -
2 stops33h 43m
Thu 10/1213:16 -
2 stops19h 49m
Deal found 29/8£616
Thu 22/1011:20 -
3 stops42h 35m
Tue 27/1006:30 -
2 stops23h 10m
Deal found 29/8£1,642
Tue 27/1014:15 -
2 stops36h 15m
Sun 8/1121:30 -
2 stops48h 55m
Deal found 28/8£1,667
Thu 1/1017:35 -
2 stops37h 21m
Wed 28/1010:50 -
2 stops28h 45m
Deal found 29/8£787
Mon 28/910:25 -
2 stops20h 55m
Tue 6/1013:30 -
1 stop18h 30m
Deal found 29/8£719
Fri 18/906:20 -
2 stops20h 25m
Mon 5/1019:00 -
2 stops14h 10m
Deal found 28/8£747
Sat 24/1009:00 -
2 stops20h 03m
Tue 3/1110:50 -
2 stops42h 00m
Deal found 26/8£618
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 30 August 2026.
Sat 17/1017:45 -
Nonstop10h 29m
Sun 1/1116:50 -
Nonstop9h 50m
Deal found 27/8£516
Thu 22/1017:00 -
Nonstop10h 00m
Mon 2/1118:55 -
Nonstop9h 25m
Deal found 26/8£520
Sat 26/1214:45 -
Nonstop10h 05m
Fri 8/118:55 -
Nonstop9h 25m
Deal found 25/8£522
Mon 19/1017:45 -
Nonstop10h 29m
Tue 27/1017:45 -
Nonstop9h 55m
Deal found 25/8£524
Wed 30/911:40 -
Nonstop10h 20m
Sun 11/1021:50 -
Nonstop9h 45m
Deal found 25/8£524
Sun 20/1214:45 -
Nonstop10h 05m
Thu 31/1218:55 -
Nonstop9h 25m
Deal found 29/8£525
Fri 2/1011:40 -
Nonstop10h 20m
Mon 5/1017:30 -
Nonstop9h 50m
Deal found 29/8£526
Fri 15/114:55 -
Nonstop9h 55m
Fri 22/118:45 -
Nonstop9h 25m
Deal found 26/8£527
Sun 13/1214:45 -
Nonstop10h 05m
Wed 30/1218:55 -
Nonstop9h 25m
Deal found 29/8£528
Tue 29/917:00 -
Nonstop10h 00m
Wed 7/1021:40 -
Nonstop9h 25m
Deal found 25/8£533
Fri 25/917:00 -
Nonstop10h 00m
Mon 12/1021:40 -
Nonstop9h 25m
Deal found 26/8£534
Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 30 August 2026 and is based on user searches.
Wed 2/911:50 -
1 stop12h 50m
Wed 16/917:35 -
Nonstop9h 50m
Deal found 26/8£519
Wed 2/913:05 -
1 stop12h 50m
Wed 16/915:40 -
1 stop12h 15m
Deal found 24/8£521
Mon 7/910:25 -
2 stops21h 29m
Tue 15/923:08 -
2 stops26h 17m
Deal found 29/8£520
Wed 9/915:40 -
1 stop34h 15m
Tue 26/114:35 -
1 stop12h 20m
Deal found 26/8£522
Thu 17/912:00 -
1 stop13h 10m
Mon 5/1010:26 -
1 stop14h 39m
Deal found 26/8£523
Thu 17/908:55 -
1 stop15h 47m
Mon 21/913:40 -
1 stop13h 35m
Deal found 26/8£524
Thu 17/919:50 -
2 stops24h 05m
Mon 28/914:10 -
3 stops26h 25m
Deal found 25/8£524
Fri 18/911:25 -
2 stops20h 01m
Mon 5/1012:43 -
1 stop12h 57m
Deal found 28/8£522
Fri 25/906:50 -
2 stops17h 18m
Sat 3/1019:25 -
2 stops17h 55m
Deal found 28/8£518
Sat 26/908:00 -
2 stops20h 37m
Sat 3/1012:43 -
1 stop12h 57m
Deal found 28/8£522
Mon 28/915:05 -
1 stop15h 42m
Fri 16/1008:25 -
1 stop14h 30m
Deal found 27/8£519
Mon 28/915:05 -
1 stop15h 42m
Wed 14/1010:50 -
1 stop18h 30m
Deal found 27/8£520
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 30 August 2026.
Thu 10/911:35 -
2 stops39h 10m
Deal found 28/8£376
Wed 9/911:35 -
2 stops30h 05m
Deal found 27/8£377
Wed 25/1109:00 -
2 stops22h 17m
Deal found 27/8£377
Wed 28/1006:35 -
1 stop14h 25m
Deal found 26/8£377
Tue 27/1020:05 -
2 stops34h 13m
Deal found 26/8£378
Wed 16/906:10 -
3 stops35h 30m
Deal found 26/8£378
Thu 22/1015:40 -
1 stop13h 00m
Deal found 28/8£379
Thu 29/1007:30 -
2 stops42h 24m
Deal found 26/8£379
Tue 20/1009:50 -
Nonstop9h 45m
Deal found 26/8£379
Thu 22/1013:05 -
1 stop12h 50m
Deal found 28/8£380
Tue 20/1020:40 -
2 stops31h 35m
Deal found 28/8£380
Wed 18/1109:00 -
2 stops19h 59m
Deal found 27/8£380
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 30 August 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 30 August 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
Tue 27/10
09:25-12:25
Nonstop10h 00m
Seattle/Tacoma Intl
Sun 8/11
07:30-06:50
1 stop15h 20m
£520
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 28/10
20:05-23:18
2 stops34h 13m
Seattle/Tacoma Intl
Wed 4/11
15:35-17:50
2 stops18h 15m
£531
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Wed 28/10
06:00-23:17
2 stops24h 17m
Seattle/Tacoma Intl
Fri 6/11
13:16-17:50
2 stops20h 34m
£531
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Wed 7/10
09:15-18:32
2 stops17h 17m
Seattle/Tacoma Intl
Wed 14/10
15:18-17:25
2 stops18h 07m
£544
LondonSeattle
LHR London Heathrow - SEA Seattle/Tacoma Intl
LHRSEA
London Heathrow
Thu 24/9
17:45-20:10
Nonstop10h 25m
Seattle/Tacoma Intl
Fri 2/10
17:30-11:20
Nonstop9h 50m
£554
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Thu 24/9
10:00-16:35
1 stop14h 35m
Seattle/Tacoma Intl
Fri 2/10
13:45-09:30
1 stop11h 45m
£570
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Fri 18/9
09:20-16:35
1 stop15h 15m
Seattle/Tacoma Intl
Tue 22/9
17:45-16:40
1 stop14h 55m
£576
LondonSeattle
LGW London Gatwick - SEA Seattle/Tacoma Intl
LGWSEA
London Gatwick
Mon 9/11
10:00-15:14
1 stop13h 14m
Seattle/Tacoma Intl
Fri 13/11
06:00-09:00
2 stops19h 00m
£578
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Fri 30/10
09:15-23:18
2 stops21h 03m
Seattle/Tacoma Intl
Thu 5/11
13:16-17:05
2 stops19h 49m
£581
LondonSeattle
LCY London City - SEA Seattle/Tacoma Intl
LCYSEA
London City
Mon 23/11
18:55-11:47
1 stop24h 52m
Seattle/Tacoma Intl
Mon 30/11
14:35-19:35
1 stop21h 00m
£586
Flights are sorted by cheapest return flights first.
Deals found on 28/8
Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
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
STN-SEA
LCY-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
STN-SEA
LCY-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 December is currently the most expensive (average of £637). 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 30 August 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 30 August 2026.
The most flights from LON to SEA are scheduled on a Friday (24 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (13 on average).
How much does it cost for a return flight from London to Seattle?
Airfare is typical for this route at the moment.
London to Seattle flights typically cost between £474 and £626 in January.The cheapest return price found within the last 5 days was £516 on KLM (11 Jan–1 Feb).
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 77% 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 £449.
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 Helsinki (HEL) offer the fastest connection on this route, with an average stopover time of 1h 03m.
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 131 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 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 6% of flights being delayed.
How far ahead should I book a flight from London to Seattle?
Booking 80 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 30 August 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 18 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. British Airways provides one of the quickest options available for as low as £520. 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?
Lufthansa, at £332, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Icelandair and Aer Lingus. 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?
£332 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 Virgin Atlantic, with prices starting from £336 and £363, 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%), American Airlines (75%) or KLM (75%) 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 £1,423 for a flight from London to Seattle. The cheapest flight overall is £314 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £359.
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 December is currently the most expensive (average of £637). 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
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Airlines
Alternative routes
Complete your trip
Direct flights to Washington
Flights by cabin class
Other flight options
Other flights from London
Popular flights
Seattle flight routes
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 30 August 2026.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 30 August 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 30 August 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.
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
We value your privacy
Cheapflights and its partners wish to use cookies or similar technologies to store and/or access information on and about your device and process personal data such as your IP address, device identifiers etc., in order to improve your experience on the site, to analyse navigation, to offer and measure personalised advertising, and to facilitate sharing on social networks. We also allow the use of third-party cookies (including those from our advertising partners) on our sites.
By clicking 'Accept', you consent to your data being processed by 0 vendors on this web site for the purposes described in this notice. You can review the vendors and their individual processing purposes on the .
To review individual processing purposes and cookie categories, please click ’Select individual purposes’. You can review your choices and withdraw your consent at any time by clicking the ’Privacy Preferences’ link in the page side navigation.