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Cheap flights from Seattle to London from $376

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 3/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:40 pm - 6:05 pm
SEA
-
LTN
18h 25m
2 stops
Multiple Airlines Logo
5:40 am - 8:40 pm
LTN
-
SEA
23h 00m
2 stops
$552Multiple Airlines
Wed, Apr 22 - Mon, Apr 27
Multiple Airlines Logo
5:40 am - 2:20 pm
SEA
-
LTN
24h 40m
3 stops
Multiple Airlines Logo
5:40 am - 9:53 pm
LTN
-
SEA
24h 13m
2 stops
$556Multiple Airlines
Mon, Apr 20 - Tue, Apr 28
Multiple Airlines Logo
3:35 pm - 10:30 pm
SEA
-
LTN
23h 55m
2 stops
Multiple Airlines Logo
4:35 pm - 6:00 pm
LTN
-
SEA
32h 25m
2 stops
$599Multiple Airlines
Mon, Mar 9 - Sun, Mar 15
Multiple Airlines Logo
8:00 am - 8:10 pm
SEA
-
LTN
29h 10m
3 stops
Multiple Airlines Logo
8:50 pm - 1:10 pm
LTN
-
SEA
23h 20m
2 stops
$612Multiple Airlines
Mon, Mar 9 - Mon, Mar 16
Multiple Airlines Logo
8:00 am - 10:40 pm
SEA
-
LTN
30h 40m
2 stops
Multiple Airlines Logo
5:40 am - 9:53 pm
LTN
-
SEA
24h 13m
2 stops
$619Multiple Airlines
Wed, Apr 8 - Mon, Apr 20
Multiple Airlines Logo
5:40 am - 11:00 am
SEA
-
LTN
21h 20m
3 stops
Multiple Airlines Logo
5:40 am - 9:53 pm
LTN
-
SEA
24h 13m
2 stops
$621Multiple Airlines
Mon, Apr 13 - Mon, Apr 20
Multiple Airlines Logo
2:35 pm - 9:05 pm
SEA
-
LTN
22h 30m
2 stops
Multiple Airlines Logo
9:40 pm - 6:25 pm
LTN
-
SEA
27h 45m
2 stops
$626Multiple Airlines
Mon, Mar 2 - Fri, Mar 13
Multiple Airlines Logo
3:40 pm - 11:35 pm
SEA
-
LTN
23h 55m
2 stops
Multiple Airlines Logo
9:40 am - 6:30 pm
LTN
-
SEA
40h 50m
3 stops
$629Multiple Airlines
Tue, Apr 21 - Tue, May 5
Multiple Airlines Logo
3:40 pm - 9:05 pm
SEA
-
LTN
21h 25m
2 stops
Multiple Airlines Logo
9:15 am - 8:40 pm
LTN
-
SEA
19h 25m
2 stops
$631Multiple Airlines
Fri, Apr 24 - Tue, Apr 28
Multiple Airlines Logo
8:00 am - 2:00 pm
SEA
-
LTN
23h 00m
3 stops
Multiple Airlines Logo
8:35 pm - 9:53 pm
LTN
-
SEA
33h 18m
3 stops
$640Multiple Airlines
Sat, Mar 21 - Sun, Mar 29

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to London Luton Airport 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, momondo users made 832,500 searches. Data last updated February 13, 2026.
Use the filters below to find and compare flights from Seattle to London Luton Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 4/22

3:40 pm-6:05 pm

2 stops18h 25m

London Luton

Mon 4/27

5:40 am-8:40 pm

2 stops23h 00m

$552

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Mon 4/20

5:40 am-2:20 pm

3 stops24h 40m

London Luton

Tue 4/28

5:40 am-9:53 pm

2 stops24h 13m

$556

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Mon 3/9

3:35 pm-10:30 pm

2 stops23h 55m

London Luton

Sun 3/15

4:35 pm-6:00 pm

2 stops32h 25m

$599

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Mon 3/9

8:00 am-8:10 pm

3 stops29h 10m

London Luton

Mon 3/16

8:50 pm-1:10 pm

2 stops23h 20m

$612

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 4/8

8:00 am-10:40 pm

2 stops30h 40m

London Luton

Mon 4/20

5:40 am-9:53 pm

2 stops24h 13m

$619

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Mon 4/13

5:40 am-11:00 am

3 stops21h 20m

London Luton

Mon 4/20

5:40 am-9:53 pm

2 stops24h 13m

$621

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Mon 3/2

2:35 pm-9:05 pm

2 stops22h 30m

London Luton

Fri 3/13

9:40 pm-6:25 pm

2 stops27h 45m

$626

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Tue 4/21

3:40 pm-11:35 pm

2 stops23h 55m

London Luton

Tue 5/5

9:40 am-6:30 pm

3 stops40h 50m

$629

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Fri 4/24

3:40 pm-9:05 pm

2 stops21h 25m

London Luton

Tue 4/28

9:15 am-8:40 pm

2 stops19h 25m

$631

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Sat 3/21

8:00 am-2:00 pm

3 stops23h 00m

London Luton

Sun 3/29

8:35 pm-9:53 pm

3 stops33h 18m

$640

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

When to book flights from Seattle to London Luton Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to London Luton Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to London Luton Airport (SEA to LTN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to London Luton Airport

Fastest flight time

12h 15m

Direct flights

None
The fastest flight from Seattle to London Luton Airport takes 12h 15m
There are no direct flights from Seattle to London Luton Airport. There are no popular flight routes from Seattle to London Luton Airport.
Search flight deals

  • How far is Seattle/Tacoma Intl to London Luton by plane?

    There are 4754.4 mi between Seattle/Tacoma Intl and London Luton. By plane, this route typically takes 12h 15m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London Luton Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to London Luton Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to London Luton Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to London Luton Airport.

  • What documentation or ID do you need to fly to London Luton Airport?

    The travel and health documents you'll need for your trip to London Luton Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Luton Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • How do I get Price Alerts for flights from Seattle to London Luton Airport?

    Confirm your travel details to search for the latest offers for flights from Seattle to London Luton Airport. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Seattle to London Luton Airport with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Crawley
Hayes
Wembley
Dartford
Croydon
Brentwood
Guildford
Harrow
Watford
Cobham
Folkestone
Romford
Stansted
Richmond

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to London?

It is quick and easy to find Seattle to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

Can I find flights from Seattle to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Seattle to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Seattle to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to London.

I’m not ready to book a flight from Seattle to London right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Seattle to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your London Luton Airport trip

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