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Cheap flights from Seattle to London from $349

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 2/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
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
$532Multiple Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Multiple Airlines Logo
2:35 pm - 8:35 pmSEA-STN
22h 00m2 stops
Multiple Airlines Logo
5:55 am - 5:00 pmSTN-SEA
19h 05m2 stops
$540Multiple Airlines
Find Deal
Fri, Jan 30 - Sun, Feb 8
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
$542Multiple Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Multiple Airlines Logo
8:05 pm - 6:20 pmSEA-STN
14h 15m1 stop
Multiple Airlines Logo
6:30 am - 6:20 pmSTN-SEA
19h 50m1 stop
$548Multiple Airlines
Find Deal
Mon, Dec 1 - Sun, Dec 7
Multiple Airlines Logo
2:35 pm - 5:50 pmSEA-STN
19h 15m2 stops
Multiple Airlines Logo
6:30 am - 5:00 pmSTN-SEA
18h 30m2 stops
$552Multiple Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Multiple Airlines Logo
2:35 pm - 3:45 pmSEA-STN
17h 10m2 stops
Multiple Airlines Logo
7:15 am - 5:00 pmSTN-SEA
17h 45m2 stops
$565Multiple Airlines
Find Deal
Mon, Feb 2 - Sat, Feb 7
Multiple Airlines Logo
10:05 am - 7:45 pmSEA-STN
25h 40m3 stops
Multiple Airlines Logo
4:20 pm - 12:10 pmSTN-SEA
27h 50m2 stops
$583Multiple Airlines
Find Deal
Fri, Jan 16 - Fri, Jan 23
Multiple Airlines Logo
2:35 pm - 11:05 pmSEA-STN
24h 30m2 stops
Multiple Airlines Logo
6:10 am - 5:00 pmSTN-SEA
18h 50m2 stops
$586Multiple Airlines
Find Deal
Fri, Jan 16 - Fri, Jan 23
Turkish Airlines Logo
8:00 pm - 10:15 pmSEA-STN
19h 15m1 stop
Turkish Airlines Logo
6:15 am - 5:15 pmSTN-SEA
19h 00m1 stop
$692Turkish Airlines
Find Deal
Wed, Mar 25 - Wed, Apr 8
Turkish Airlines Logo
8:00 pm - 10:15 pmSEA-STN
19h 15m1 stop
Turkish Airlines Logo
5:45 pm - 5:15 pmSTN-SEA
31h 30m1 stop
$714Turkish Airlines
Find Deal
Wed, Mar 25 - Wed, Apr 8

Turkish Airlines flights from Seattle to London Stansted Airport

Our best Turkish Airlines deals on Seattle to London Stansted Airport flight tickets
Turkish Airlines
Mar 25
SEA8:00 pmSeattle/Tacoma Intl
19h 15m
1 stop
STN10:15 pmLondon Stansted
Apr 8
STN6:15 amLondon Stansted
19h 00m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$692
Find similar
Turkish Airlines
Mar 25
SEA8:00 pmSeattle/Tacoma Intl
19h 15m
1 stop
STN10:15 pmLondon Stansted
Apr 8
STN5:45 pmLondon Stansted
31h 30m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$714
Find similar
Turkish Airlines
Apr 7
SEA7:10 pmSeattle/Tacoma Intl
37h 40m
1 stop
STN4:50 pmLondon Stansted
Apr 21
STN5:45 pmLondon Stansted
31h 30m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$719
Find similar

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 November 11, 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

Wed 12/3

8:05 pm-5:50 pm

1 stop13h 45m

London Stansted

Wed 12/10

6:30 am-6:20 pm

1 stop19h 50m

$532

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Fri 1/30

2:35 pm-8:35 pm

2 stops22h 00m

London Stansted

Sun 2/8

5:55 am-5:00 pm

2 stops19h 05m

$540

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 12/3

8:05 pm-5:50 pm

1 stop13h 45m

London Stansted

Wed 12/10

6:30 am-6:20 pm

1 stop19h 50m

$542

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 12/1

8:05 pm-6:20 pm

1 stop14h 15m

London Stansted

Sun 12/7

6:30 am-6:20 pm

1 stop19h 50m

$548

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 12/3

2:35 pm-5:50 pm

2 stops19h 15m

London Stansted

Wed 12/10

6:30 am-5:00 pm

2 stops18h 30m

$552

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 2/2

2:35 pm-3:45 pm

2 stops17h 10m

London Stansted

Sat 2/7

7:15 am-5:00 pm

2 stops17h 45m

$565

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Fri 1/16

10:05 am-7:45 pm

3 stops25h 40m

London Stansted

Fri 1/23

4:20 pm-12:10 pm

2 stops27h 50m

$583

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Fri 1/16

2:35 pm-11:05 pm

2 stops24h 30m

London Stansted

Fri 1/23

6:10 am-5:00 pm

2 stops18h 50m

$586

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 3/25

8:00 pm-10:15 pm

1 stop19h 15m

London Stansted

Wed 4/8

6:15 am-5:15 pm

1 stop19h 00m

$692

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 3/25

8:00 pm-10:15 pm

1 stop19h 15m

London Stansted

Wed 4/8

5:45 pm-5:15 pm

1 stop31h 30m

$714

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Seattle to London Stansted Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Seattle/Tacoma Intl to London Stansted?

Lufthansa is the most popular carrier operating from Seattle/Tacoma Intl to London Stansted

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 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.

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
Wembley
Folkestone
Romford
Ilford
Cobham
Stansted
Harrow
Watford

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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