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Cheap flights from Seattle to London from $318

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 10/4. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
6:50 pm - 3:35 pm
SEA
-
STN
12h 45m
1 stop
Lufthansa Logo
11:00 am - 4:59 pm
STN
-
SEA
13h 59m
1 stop
$851Lufthansa
Wed, Sep 16 - Tue, Sep 22
Lufthansa Logo
6:50 pm - 3:35 pm
SEA
-
STN
12h 45m
1 stop
Lufthansa Logo
11:00 am - 4:59 pm
STN
-
SEA
13h 59m
1 stop
$857Lufthansa
Wed, Sep 16 - Wed, Sep 30
Multiple Airlines Logo
3:40 pm - 5:05 pm
SEA
-
STN
17h 25m
2 stops
Multiple Airlines Logo
7:10 pm - 9:40 am
STN
-
SEA
46h 30m
3 stops
$860Multiple Airlines
Mon, Jul 13 - Wed, Jul 22
Lufthansa Logo
8:10 am - 3:35 pm
SEA
-
STN
23h 25m
2 stops
Lufthansa Logo
11:00 am - 4:59 pm
STN
-
SEA
13h 59m
1 stop
$862Lufthansa
Wed, Sep 16 - Tue, Sep 29
Multiple Airlines Logo
6:00 pm - 12:05 am
SEA
-
STN
22h 05m
2 stops
Multiple Airlines Logo
8:05 pm - 4:10 pm
STN
-
SEA
28h 05m
2 stops
$863Multiple Airlines
Fri, Aug 14 - Sun, Aug 23
Multiple Airlines Logo
3:40 pm - 9:20 pm
SEA
-
STN
21h 40m
2 stops
Multiple Airlines Logo
10:10 pm - 9:40 am
STN
-
SEA
43h 30m
3 stops
$864Multiple Airlines
Sun, Jul 19 - Sun, Jul 26
Multiple Airlines Logo
11:25 pm - 12:30 am
SEA
-
STN
17h 05m
2 stops
Multiple Airlines Logo
7:00 am - 5:55 pm
STN
-
SEA
18h 55m
2 stops
$865Multiple Airlines
Thu, Aug 20 - Wed, Sep 2
Multiple Airlines Logo
8:00 am - 12:20 am
SEA
-
STN
32h 20m
3 stops
Multiple Airlines Logo
6:30 am - 9:40 am
STN
-
SEA
35h 10m
3 stops
$866Multiple Airlines
Mon, Sep 7 - Mon, Sep 28
Lufthansa Logo
6:50 pm - 3:35 pm
SEA
-
STN
12h 45m
1 stop
Lufthansa Logo
4:25 pm - 4:59 pm
STN
-
SEA
32h 34m
1 stop
$867Lufthansa
Wed, Sep 16 - Mon, Sep 28
Lufthansa Logo
6:50 pm - 3:35 pm
SEA
-
STN
12h 45m
1 stop
Lufthansa Logo
4:25 pm - 4:59 pm
STN
-
SEA
32h 34m
1 stop
$868Lufthansa
Wed, Sep 16 - Mon, Oct 5

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Turkish Airlines flights from Seattle to London Stansted Airport

Our best Turkish Airlines deals on Seattle to London Stansted Airport flight tickets
Turkish Airlines
Aug 18
SEA7:15 pmSeattle/Tacoma Intl
37h 25m
1 stop
STN4:40 pmLondon Stansted
Sep 30
STN10:50 amLondon Stansted
38h 30m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$878
Turkish Airlines
Aug 18
SEA7:15 pmSeattle/Tacoma Intl
37h 25m
1 stop
STN4:40 pmLondon Stansted
Sep 30
STN10:50 amLondon Stansted
38h 30m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$879
Turkish Airlines
Sep 17
SEA7:15 pmSeattle/Tacoma Intl
30h 40m
1 stop
STN9:55 amLondon Stansted
Sep 24
STN5:35 pmLondon Stansted
31h 45m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$897

Lufthansa flights from Seattle to London Stansted Airport

Our best Lufthansa deals on Seattle to London Stansted Airport flight tickets
Lufthansa
Sep 16
SEA6:50 pmSeattle/Tacoma Intl
12h 45m
1 stop
STN3:35 pmLondon Stansted
Sep 22
STN11:00 amLondon Stansted
13h 59m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$851
Lufthansa
Sep 16
SEA6:50 pmSeattle/Tacoma Intl
12h 45m
1 stop
STN3:35 pmLondon Stansted
Sep 30
STN11:00 amLondon Stansted
13h 59m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$857
Lufthansa
Sep 16
SEA8:10 amSeattle/Tacoma Intl
23h 25m
2 stops
STN3:35 pmLondon Stansted
Sep 29
STN11:00 amLondon Stansted
13h 59m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$862

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 June 20, 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

Cheapest round-trip
Quickest round-trip

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 9/16

6:50 pm-3:35 pm

1 stop12h 45m

London Stansted

Tue 9/22

11:00 am-4:59 pm

1 stop13h 59m

$851

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 9/16

6:50 pm-3:35 pm

1 stop12h 45m

London Stansted

Wed 9/30

11:00 am-4:59 pm

1 stop13h 59m

$857

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 7/13

3:40 pm-5:05 pm

2 stops17h 25m

London Stansted

Wed 7/22

7:10 pm-9:40 am

3 stops46h 30m

$860

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 9/16

8:10 am-3:35 pm

2 stops23h 25m

London Stansted

Tue 9/29

11:00 am-4:59 pm

1 stop13h 59m

$862

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Fri 8/14

6:00 pm-12:05 am

2 stops22h 05m

London Stansted

Sun 8/23

8:05 pm-4:10 pm

2 stops28h 05m

$863

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 7/19

3:40 pm-9:20 pm

2 stops21h 40m

London Stansted

Sun 7/26

10:10 pm-9:40 am

3 stops43h 30m

$864

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Thu 8/20

11:25 pm-12:30 am

2 stops17h 05m

London Stansted

Wed 9/2

7:00 am-5:55 pm

2 stops18h 55m

$865

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 9/7

8:00 am-12:20 am

3 stops32h 20m

London Stansted

Mon 9/28

6:30 am-9:40 am

3 stops35h 10m

$866

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 9/16

6:50 pm-3:35 pm

1 stop12h 45m

London Stansted

Mon 9/28

4:25 pm-4:59 pm

1 stop32h 34m

$867

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 9/16

6:50 pm-3:35 pm

1 stop12h 45m

London Stansted

Mon 10/5

4:25 pm-4:59 pm

1 stop32h 34m

$868

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

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

Frequently asked questions about flying from Seattle to London Stansted Airport

  • 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.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Dover
Hayes
Crawley
Croydon
Wembley
Stansted
Harrow
Slough
Brentwood
Watford
Cobham
Guildford
Ilford
Folkestone
Uxbridge
Romford

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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