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Cheap flights from Seattle to London from $272

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 10/16. 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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Cheap round-trip flights

Multiple Airlines Logo
3:50 pm - 3:50 pmSEA-STN
16h 00m2 stops
Multiple Airlines Logo
6:30 am - 6:00 pmSTN-SEA
18h 30m2 stops
$511Multiple Airlines
Find Deal
Sat, Oct 25 - Fri, Oct 31
Multiple Airlines Logo
3:45 pm - 4:20 pmSEA-STN
16h 35m2 stops
Multiple Airlines Logo
8:15 am - 5:50 pmSTN-SEA
17h 35m2 stops
$514Multiple Airlines
Find Deal
Wed, Oct 15 - Wed, Oct 22
Multiple Airlines Logo
3:45 pm - 6:20 pmSEA-STN
18h 35m2 stops
Multiple Airlines Logo
8:15 am - 8:40 pmSTN-SEA
20h 25m2 stops
$519Multiple Airlines
Find Deal
Mon, Oct 6 - Mon, Oct 13
Multiple Airlines Logo
10:00 am - 2:20 pmSEA-STN
20h 20m2 stops
Multiple Airlines Logo
10:35 pm - 2:16 pmSTN-SEA
23h 41m2 stops
$520Multiple Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 21
Multiple Airlines Logo
3:45 pm - 6:00 pmSEA-STN
18h 15m2 stops
Multiple Airlines Logo
8:15 am - 5:50 pmSTN-SEA
17h 35m2 stops
$524Multiple Airlines
Find Deal
Sun, Oct 5 - Thu, Oct 9
Multiple Airlines Logo
3:10 pm - 9:05 pmSEA-STN
21h 55m2 stops
Multiple Airlines Logo
9:45 pm - 10:06 pmSTN-SEA
32h 21m3 stops
$526Multiple Airlines
Find Deal
Wed, Dec 3 - Tue, Dec 9
Multiple Airlines Logo
5:50 am - 5:50 pmSEA-STN
28h 00m3 stops
Multiple Airlines Logo
9:45 pm - 7:16 pmSTN-SEA
29h 31m3 stops
$529Multiple Airlines
Find Deal
Wed, Dec 3 - Tue, Dec 9
Multiple Airlines Logo
8:05 pm - 5:50 pmSEA-STN
13h 45m1 stop
Multiple Airlines Logo
6:30 am - 6:20 pmSTN-SEA
19h 50m1 stop
$537Multiple Airlines
Find Deal
Wed, Nov 19 - Wed, Dec 3
Multiple Airlines Logo
8:05 pm - 5:50 pmSEA-STN
13h 45m1 stop
Multiple Airlines Logo
6:30 am - 6:20 pmSTN-SEA
19h 50m1 stop
$539Multiple Airlines
Find Deal
Wed, Nov 19 - Wed, Nov 26
Multiple Airlines Logo
8:10 am - 11:05 amSEA-STN
18h 55m2 stops
Multiple Airlines Logo
8:00 pm - 10:16 pmSTN-SEA
34h 16m2 stops
$541Multiple Airlines
Find Deal
Sun, Nov 9 - Sat, Nov 15

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to London Stansted 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 September 18, 2025.
Use the filters below to find and compare flights from Seattle to London Stansted Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sat 10/25

3:50 pm-3:50 pm

2 stops16h 00m

London Stansted

Fri 10/31

6:30 am-6:00 pm

2 stops18h 30m

$511

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 10/15

3:45 pm-4:20 pm

2 stops16h 35m

London Stansted

Wed 10/22

8:15 am-5:50 pm

2 stops17h 35m

$514

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 10/6

3:45 pm-6:20 pm

2 stops18h 35m

London Stansted

Mon 10/13

8:15 am-8:40 pm

2 stops20h 25m

$519

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Tue 10/14

10:00 am-2:20 pm

2 stops20h 20m

London Stansted

Tue 10/21

10:35 pm-2:16 pm

2 stops23h 41m

$520

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 10/5

3:45 pm-6:00 pm

2 stops18h 15m

London Stansted

Thu 10/9

8:15 am-5:50 pm

2 stops17h 35m

$524

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 12/3

3:10 pm-9:05 pm

2 stops21h 55m

London Stansted

Tue 12/9

9:45 pm-10:06 pm

3 stops32h 21m

$526

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 12/3

5:50 am-5:50 pm

3 stops28h 00m

London Stansted

Tue 12/9

9:45 pm-7:16 pm

3 stops29h 31m

$529

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 11/19

8:05 pm-5:50 pm

1 stop13h 45m

London Stansted

Wed 12/3

6:30 am-6:20 pm

1 stop19h 50m

$537

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 11/19

8:05 pm-5:50 pm

1 stop13h 45m

London Stansted

Wed 11/26

6:30 am-6:20 pm

1 stop19h 50m

$539

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 11/9

8:10 am-11:05 am

2 stops18h 55m

London Stansted

Sat 11/15

8:00 pm-10:16 pm

2 stops34h 16m

$541

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 Stansted Airport

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

Cheap Seattle to London Stansted Airport (SEA to STN) flight deals and tips

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

Direct flights

None
There are no direct flights from Seattle to London Stansted Airport. There are no popular flight routes from Seattle to London Stansted Airport.
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  • How far is Seattle/Tacoma Intl to London Stansted by plane?

    There are 4769.5 mi between Seattle/Tacoma Intl and London Stansted. Flights usually cover this in 12h 15m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Seattle/Tacoma Intl Airport to London Stansted Airport are updated daily.

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to London Stansted Airport.

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

    The travel and health documents you'll need for your trip to London Stansted 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 Stansted 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 Stansted Airport?

    Confirm your travel details to search for the latest offers for flights from Seattle to London Stansted 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 Stansted 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 show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near London?

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

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Seattle.

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

All flight searches from Seattle to London on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search for Seattle to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to London from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your London Stansted Airport trip

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