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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 1/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
2:35 pm - 5:05 pmSEA-LTN
18h 30m2 stops
Multiple Airlines Logo
6:50 am - 5:00 pmLTN-SEA
18h 10m2 stops
$523Multiple Airlines
Find Deal
Wed, Nov 12 - Wed, Nov 19
Multiple Airlines Logo
2:35 pm - 11:05 pmSEA-LTN
24h 30m2 stops
Multiple Airlines Logo
6:50 am - 5:00 pmLTN-SEA
18h 10m2 stops
$525Multiple Airlines
Find Deal
Wed, Nov 12 - Wed, Nov 19
Multiple Airlines Logo
8:05 pm - 4:15 pmSEA-LTN
12h 10m1 stop
Multiple Airlines Logo
5:50 am - 6:20 pmLTN-SEA
20h 30m1 stop
$550Multiple Airlines
Find Deal
Fri, Nov 7 - Fri, Nov 14
Multiple Airlines Logo
5:50 am - 11:00 pmSEA-LTN
33h 10m3 stops
Multiple Airlines Logo
5:00 pm - 12:10 pmLTN-SEA
27h 10m2 stops
$558Multiple Airlines
Find Deal
Thu, Nov 27 - Wed, Dec 3
Multiple Airlines Logo
2:35 pm - 1:20 pmSEA-LTN
14h 45m2 stops
Multiple Airlines Logo
9:00 am - 5:00 pmLTN-SEA
16h 00m2 stops
$576Multiple Airlines
Find Deal
Thu, Nov 13 - Thu, Nov 27
Multiple Airlines Logo
2:35 pm - 1:20 pmSEA-LTN
14h 45m2 stops
Multiple Airlines Logo
9:00 am - 5:00 pmLTN-SEA
16h 00m2 stops
$579Multiple Airlines
Find Deal
Thu, Nov 13 - Thu, Nov 27
Multiple Airlines Logo
10:05 am - 11:05 pmSEA-LTN
29h 00m3 stops
Multiple Airlines Logo
5:10 pm - 12:10 pmLTN-SEA
27h 00m2 stops
$583Multiple Airlines
Find Deal
Wed, Nov 12 - Wed, Nov 19
Multiple Airlines Logo
2:35 pm - 5:05 pmSEA-LTN
18h 30m2 stops
Multiple Airlines Logo
6:50 am - 5:00 pmLTN-SEA
18h 10m2 stops
$593Multiple Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Multiple Airlines Logo
8:05 pm - 4:45 pmSEA-LTN
12h 40m1 stop
Multiple Airlines Logo
6:00 am - 6:20 pmLTN-SEA
20h 20m1 stop
$595Multiple Airlines
Find Deal
Sun, Nov 30 - Mon, Dec 8
Multiple Airlines Logo
3:10 pm - 8:10 pmSEA-LTN
21h 00m2 stops
Multiple Airlines Logo
5:50 am - 10:16 pmLTN-SEA
24h 26m2 stops
$599Multiple Airlines
Find Deal
Fri, Nov 28 - Fri, Dec 5

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 October 30, 2025.
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 11/12

2:35 pm-5:05 pm

2 stops18h 30m

London Luton

Wed 11/19

6:50 am-5:00 pm

2 stops18h 10m

$523

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 11/12

2:35 pm-11:05 pm

2 stops24h 30m

London Luton

Wed 11/19

6:50 am-5:00 pm

2 stops18h 10m

$525

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Fri 11/7

8:05 pm-4:15 pm

1 stop12h 10m

London Luton

Fri 11/14

5:50 am-6:20 pm

1 stop20h 30m

$550

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Thu 11/27

5:50 am-11:00 pm

3 stops33h 10m

London Luton

Wed 12/3

5:00 pm-12:10 pm

2 stops27h 10m

$558

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Thu 11/13

2:35 pm-1:20 pm

2 stops14h 45m

London Luton

Thu 11/27

9:00 am-5:00 pm

2 stops16h 00m

$576

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Thu 11/13

2:35 pm-1:20 pm

2 stops14h 45m

London Luton

Thu 11/27

9:00 am-5:00 pm

2 stops16h 00m

$579

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 11/12

10:05 am-11:05 pm

3 stops29h 00m

London Luton

Wed 11/19

5:10 pm-12:10 pm

2 stops27h 00m

$583

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 12/3

2:35 pm-5:05 pm

2 stops18h 30m

London Luton

Wed 12/10

6:50 am-5:00 pm

2 stops18h 10m

$593

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Sun 11/30

8:05 pm-4:45 pm

1 stop12h 40m

London Luton

Mon 12/8

6:00 am-6:20 pm

1 stop20h 20m

$595

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Fri 11/28

3:10 pm-8:10 pm

2 stops21h 00m

London Luton

Fri 12/5

5:50 am-10:16 pm

2 stops24h 26m

$599

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

Direct flights

None
There are no direct flights from Seattle to London Luton Airport. There are no popular flight routes from Seattle to London Luton Airport.
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  • 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 10m.

  • 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
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Brentwood
Chelmsford
Folkestone
Romford
Ilford
Cobham
Wembley
Stansted
Watford
Harrow

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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