Cheap flights from London Stansted Airport to Seattle from £239

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Stansted Airport to Seattle departing on 15/9. 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 London Stansted Airport to Seattle

Cheap return flights

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08:15 - 11:55STN-SEA
35h 40m2 stops
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14:20 - 20:30SEA-STN
22h 10m2 stops
Tue, 16 Sep - Tue, 23 Sep
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13:20 - 17:50STN-SEA
12h 30m1 stop
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19:35 - 15:20SEA-STN
11h 45m1 stop
Mon, 15 Sep - Mon, 29 Sep
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19:35 - 14:16STN-SEA
26h 41m3 stops
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12:00 - 22:10SEA-STN
26h 10m3 stops
Mon, 15 Sep - Mon, 29 Sep
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19:35 - 11:55STN-SEA
24h 20m2 stops
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14:20 - 22:10SEA-STN
23h 50m2 stops
Mon, 15 Sep - Mon, 29 Sep
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08:15 - 09:22STN-SEA
33h 07m3 stops
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10:00 - 21:15SEA-STN
27h 15m3 stops
Tue, 16 Sep - Tue, 23 Sep
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08:15 - 09:22STN-SEA
33h 07m3 stops
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10:00 - 14:25SEA-STN
20h 25m3 stops
Wed, 10 Sep - Wed, 17 Sep
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08:15 - 19:14STN-SEA
18h 59m2 stops
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12:00 - 14:25SEA-STN
18h 25m2 stops
Wed, 10 Sep - Wed, 17 Sep
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09:05 - 22:16STN-SEA
21h 11m3 stops
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10:00 - 20:00SEA-STN
26h 00m3 stops
Wed, 24 Sep - Wed, 1 Oct
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09:05 - 17:50STN-SEA
16h 45m1 stop
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19:35 - 16:20SEA-STN
12h 45m1 stop
Wed, 10 Sep - Wed, 17 Sep
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07:05 - 20:40STN-SEA
21h 35m2 stops
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19:00 - 19:50SEA-STN
16h 50m2 stops
Wed, 24 Sep - Wed, 1 Oct

momondo Fare Finder

 
Customise your flight search to find flights from London Stansted Airport to Seattle 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 279,928 searches. Data last updated 4 August 2025.
Use the filters below to find and compare flights from London Stansted Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

STN - SEA

STNSEA

London Stansted

Tue 16/9

08:15-11:55

2 stops35h 40m

Seattle/Tacoma Intl

Tue 23/9

14:20-20:30

2 stops22h 10m

£440

LondonSeattle

STN - SEA

STNSEA

London Stansted

Mon 15/9

13:20-17:50

1 stop12h 30m

Seattle/Tacoma Intl

Mon 29/9

19:35-15:20

1 stop11h 45m

£459

LondonSeattle

STN - SEA

STNSEA

London Stansted

Mon 15/9

19:35-14:16

3 stops26h 41m

Seattle/Tacoma Intl

Mon 29/9

12:00-22:10

3 stops26h 10m

£508

LondonSeattle

STN - SEA

STNSEA

London Stansted

Mon 15/9

19:35-11:55

2 stops24h 20m

Seattle/Tacoma Intl

Mon 29/9

14:20-22:10

2 stops23h 50m

£517

LondonSeattle

STN - SEA

STNSEA

London Stansted

Tue 16/9

08:15-09:22

3 stops33h 07m

Seattle/Tacoma Intl

Tue 23/9

10:00-21:15

3 stops27h 15m

£529

LondonSeattle

STN - SEA

STNSEA

London Stansted

Wed 10/9

08:15-09:22

3 stops33h 07m

Seattle/Tacoma Intl

Wed 17/9

10:00-14:25

3 stops20h 25m

£561

LondonSeattle

STN - SEA

STNSEA

London Stansted

Wed 10/9

08:15-19:14

2 stops18h 59m

Seattle/Tacoma Intl

Wed 17/9

12:00-14:25

2 stops18h 25m

£596

LondonSeattle

STN - SEA

STNSEA

London Stansted

Wed 24/9

09:05-22:16

3 stops21h 11m

Seattle/Tacoma Intl

Wed 1/10

10:00-20:00

3 stops26h 00m

£605

LondonSeattle

STN - SEA

STNSEA

London Stansted

Wed 10/9

09:05-17:50

1 stop16h 45m

Seattle/Tacoma Intl

Wed 17/9

19:35-16:20

1 stop12h 45m

£611

LondonSeattle

STN - SEA

STNSEA

London Stansted

Wed 24/9

07:05-20:40

2 stops21h 35m

Seattle/Tacoma Intl

Wed 1/10

19:00-19:50

2 stops16h 50m

£615

Flights are sorted by cheapest return flights first.

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

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

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 day to depart on your flight to Seattle?

According to our data, Tuesday is the cheapest day to fly to Seattle from London Stansted Airport. The lowest ticket price found for a Tuesday departure recently was £602. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Sunday is £724.

What is the cheapest time of day to depart on your flight to Seattle?

According to our data, the cheapest time of day to fly to Seattle is in the evening. momondo users have found flights departing from London Stansted Airport to Seattle in the evening for as low as £531. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive, with an average ticket price of £637.

When to book flights from London Stansted Airport to Seattle

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

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

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

Best price found

£239

Fastest flight time

12h 20m

Direct flights

None

Airports in Seattle

1 airport
The best one-way flight to Seattle from London Stansted Airport in the past 72 hours is £239. The best return flight deal from London Stansted Airport to Seattle found on momondo in the last 72 hours is £440.
The fastest flight from London Stansted Airport to Seattle takes 12h 20m
There are no direct flights from London Stansted Airport to Seattle. Popular non-direct route for this connection is London Stansted Airport - Seattle/Tacoma Intl Airport.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

  • How far is London Stansted to Seattle/Tacoma Intl by plane?

    A flight from London Stansted to Seattle/Tacoma Intl will travel around 4769.5 mi. Flights usually cover this in 12h 20m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from London Stansted Airport to Seattle/Tacoma Intl Airport were last updated today.

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Stansted Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.


Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Kent
SeaTac
Fife
Tukwila
Renton

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Seattle. momondo saves you time and could save you money on your trip.

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

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

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

momondo helps you find the best flight between London and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are not ready to book a flight from London to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.


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1 adult
Sat 9/8
Sat 16/8

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