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Cheap flights from Seattle to London from $345

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 2/1. 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
8:10 am - 6:40 pm
SEA
-
STN
26h 30m2 stops
Multiple Airlines Logo
6:05 pm - 7:16 pm
STN
-
SEA
33h 11m3 stops
$586Multiple Airlines
Mon, Feb 2 - Sun, Feb 8
Multiple Airlines Logo
8:10 am - 10:55 pm
SEA
-
STN
30h 45m3 stops
Multiple Airlines Logo
6:00 pm - 1:20 pm
STN
-
SEA
27h 20m2 stops
$587Multiple Airlines
Sat, Jan 17 - Sat, Jan 24
Multiple Airlines Logo
3:10 pm - 10:35 pm
SEA
-
STN
23h 25m2 stops
Multiple Airlines Logo
6:00 pm - 1:20 pm
STN
-
SEA
27h 20m2 stops
$594Multiple Airlines
Fri, Jan 16 - Sat, Jan 24
Multiple Airlines Logo
2:00 pm - 3:10 pm
SEA
-
STN
17h 10m2 stops
Multiple Airlines Logo
9:00 pm - 7:16 pm
STN
-
SEA
30h 16m3 stops
$597Multiple Airlines
Sat, Jan 24 - Sat, Jan 31
Multiple Airlines Logo
8:00 am - 7:30 pm
SEA
-
STN
27h 30m2 stops
Multiple Airlines Logo
10:00 pm - 12:20 pm
STN
-
SEA
22h 20m2 stops
$601Multiple Airlines
Wed, Apr 1 - Tue, Apr 7
Multiple Airlines Logo
3:10 pm - 8:55 pm
SEA
-
STN
21h 45m2 stops
Multiple Airlines Logo
9:40 pm - 12:10 pm
STN
-
SEA
22h 30m2 stops
$602Multiple Airlines
Sun, Feb 15 - Sun, Feb 22
Multiple Airlines Logo
6:50 pm - 11:20 pm
SEA
-
STN
20h 30m2 stops
Multiple Airlines Logo
6:30 am - 9:51 pm
STN
-
SEA
23h 21m2 stops
$603Multiple Airlines
Wed, Apr 1 - Wed, Apr 8
Multiple Airlines Logo
8:10 am - 9:35 pm
SEA
-
STN
29h 25m3 stops
Multiple Airlines Logo
6:05 pm - 12:10 pm
STN
-
SEA
26h 05m2 stops
$615Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
Multiple Airlines Logo
8:05 pm - 9:20 pm
SEA
-
STN
17h 15m1 stop
Multiple Airlines Logo
6:30 am - 7:20 pm
STN
-
SEA
19h 50m1 stop
$624Multiple Airlines
Mon, Mar 2 - Wed, Mar 11
Multiple Airlines Logo
6:45 pm - 7:30 pm
SEA
-
STN
16h 45m1 stop
Multiple Airlines Logo
11:40 am - 4:59 pm
STN
-
SEA
13h 19m1 stop
$629Multiple Airlines
Wed, May 6 - Wed, May 13

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 December 4, 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

Mon 2/2

8:10 am-6:40 pm

2 stops26h 30m

London Stansted

Sun 2/8

6:05 pm-7:16 pm

3 stops33h 11m

$586

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sat 1/17

8:10 am-10:55 pm

3 stops30h 45m

London Stansted

Sat 1/24

6:00 pm-1:20 pm

2 stops27h 20m

$587

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Fri 1/16

3:10 pm-10:35 pm

2 stops23h 25m

London Stansted

Sat 1/24

6:00 pm-1:20 pm

2 stops27h 20m

$594

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sat 1/24

2:00 pm-3:10 pm

2 stops17h 10m

London Stansted

Sat 1/31

9:00 pm-7:16 pm

3 stops30h 16m

$597

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 4/1

8:00 am-7:30 pm

2 stops27h 30m

London Stansted

Tue 4/7

10:00 pm-12:20 pm

2 stops22h 20m

$601

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 2/15

3:10 pm-8:55 pm

2 stops21h 45m

London Stansted

Sun 2/22

9:40 pm-12:10 pm

2 stops22h 30m

$602

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 4/1

6:50 pm-11:20 pm

2 stops20h 30m

London Stansted

Wed 4/8

6:30 am-9:51 pm

2 stops23h 21m

$603

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 1/18

8:10 am-9:35 pm

3 stops29h 25m

London Stansted

Sun 1/25

6:05 pm-12:10 pm

2 stops26h 05m

$615

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 3/2

8:05 pm-9:20 pm

1 stop17h 15m

London Stansted

Wed 3/11

6:30 am-7:20 pm

1 stop19h 50m

$624

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 5/6

6:45 pm-7:30 pm

1 stop16h 45m

London Stansted

Wed 5/13

11:40 am-4:59 pm

1 stop13h 19m

$629

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

14h 45m

Direct flights

None
The fastest flight from Seattle to London Stansted Airport takes 14h 45m
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 11h 50m, 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
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Brentwood
Wembley
Romford
Watford
Ilford
Cobham
Folkestone
Uxbridge
Stansted
Chelmsford

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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