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Cheap flights from Seattle to London from $375

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
3:35 pm - 6:50 pm
SEA
-
STN
20h 15m
2 stops
Multiple Airlines Logo
6:00 pm - 6:00 pm
STN
-
SEA
31h 00m
2 stops
$546Multiple Airlines
Mon, Mar 9 - Sun, Mar 15
Multiple Airlines Logo
3:40 pm - 7:50 pm
SEA
-
STN
20h 10m
2 stops
Multiple Airlines Logo
7:15 am - 8:40 pm
STN
-
SEA
21h 25m
2 stops
$551Multiple Airlines
Mon, Apr 13 - Mon, Apr 20
Multiple Airlines Logo
5:40 am - 10:25 pm
SEA
-
STN
32h 45m
3 stops
Multiple Airlines Logo
6:55 pm - 12:20 pm
STN
-
SEA
25h 25m
2 stops
$552Multiple Airlines
Mon, Apr 20 - Sun, Apr 26
Multiple Airlines Logo
5:40 am - 2:45 pm
SEA
-
STN
25h 05m
3 stops
Multiple Airlines Logo
7:55 am - 10:50 pm
STN
-
SEA
22h 55m
3 stops
$553Multiple Airlines
Mon, Apr 20 - Tue, Apr 28
Multiple Airlines Logo
3:40 pm - 10:25 pm
SEA
-
STN
22h 45m
2 stops
Multiple Airlines Logo
10:45 pm - 9:33 am
STN
-
SEA
42h 48m
3 stops
$559Multiple Airlines
Mon, Apr 13 - Wed, Apr 22
Multiple Airlines Logo
3:40 pm - 10:25 pm
SEA
-
STN
22h 45m
2 stops
Multiple Airlines Logo
10:45 pm - 9:40 am
STN
-
SEA
42h 55m
3 stops
$561Multiple Airlines
Mon, Apr 20 - Mon, Apr 27
Multiple Airlines Logo
3:40 pm - 7:50 pm
SEA
-
STN
20h 10m
2 stops
Multiple Airlines Logo
6:25 am - 8:40 pm
STN
-
SEA
22h 15m
2 stops
$563Multiple Airlines
Mon, Apr 13 - Wed, Apr 22
Multiple Airlines Logo
3:40 pm - 7:35 pm
SEA
-
STN
19h 55m
2 stops
Multiple Airlines Logo
7:15 am - 8:40 pm
STN
-
SEA
21h 25m
2 stops
$564Multiple Airlines
Sun, Apr 19 - Tue, Apr 28
Multiple Airlines Logo
3:40 pm - 7:35 pm
SEA
-
STN
19h 55m
2 stops
Multiple Airlines Logo
7:15 am - 5:55 pm
STN
-
SEA
18h 40m
2 stops
$567Multiple Airlines
Sun, Apr 19 - Tue, Apr 28
Multiple Airlines Logo
3:40 pm - 9:30 pm
SEA
-
STN
21h 50m
2 stops
Multiple Airlines Logo
6:40 am - 8:40 pm
STN
-
SEA
22h 00m
2 stops
$576Multiple Airlines
Wed, Apr 22 - Mon, Apr 27

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 February 12, 2026.
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

Mon 3/9

3:35 pm-6:50 pm

2 stops20h 15m

London Stansted

Sun 3/15

6:00 pm-6:00 pm

2 stops31h 00m

$546

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 4/13

3:40 pm-7:50 pm

2 stops20h 10m

London Stansted

Mon 4/20

7:15 am-8:40 pm

2 stops21h 25m

$551

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 4/20

5:40 am-10:25 pm

3 stops32h 45m

London Stansted

Sun 4/26

6:55 pm-12:20 pm

2 stops25h 25m

$552

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 4/20

5:40 am-2:45 pm

3 stops25h 05m

London Stansted

Tue 4/28

7:55 am-10:50 pm

3 stops22h 55m

$553

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 4/13

3:40 pm-10:25 pm

2 stops22h 45m

London Stansted

Wed 4/22

10:45 pm-9:33 am

3 stops42h 48m

$559

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 4/20

3:40 pm-10:25 pm

2 stops22h 45m

London Stansted

Mon 4/27

10:45 pm-9:40 am

3 stops42h 55m

$561

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 4/13

3:40 pm-7:50 pm

2 stops20h 10m

London Stansted

Wed 4/22

6:25 am-8:40 pm

2 stops22h 15m

$563

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 4/19

3:40 pm-7:35 pm

2 stops19h 55m

London Stansted

Tue 4/28

7:15 am-8:40 pm

2 stops21h 25m

$564

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 4/19

3:40 pm-7:35 pm

2 stops19h 55m

London Stansted

Tue 4/28

7:15 am-5:55 pm

2 stops18h 40m

$567

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 4/22

3:40 pm-9:30 pm

2 stops21h 50m

London Stansted

Mon 4/27

6:40 am-8:40 pm

2 stops22h 00m

$576

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 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

Fastest flight time

12h 45m

Direct flights

None
The fastest flight from Seattle to London Stansted Airport takes 12h 45m
There are no direct flights from Seattle to London Stansted Airport. There are no popular flight routes from Seattle to London Stansted Airport.
Search flight deals

  • 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 45m, 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
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?

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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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