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Cheap flights from Seattle to London from £231

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 12/10. 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 return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
15:40 - 16:50
SEA
-
SOU
17h 10m
2 stops
Multiple Airlines Logo
09:15 - 17:55
SOU
-
SEA
16h 40m
2 stops
£666Multiple Airlines
Tue, 25 Aug - Tue, 1 Sep
Multiple Airlines Logo
19:00 - 12:50
SEA
-
SOU
33h 50m
2 stops
Multiple Airlines Logo
09:20 - 17:10
SOU
-
SEA
15h 50m
1 stop
£718Multiple Airlines
Sun, 30 Aug - Wed, 30 Sep
Multiple Airlines Logo
15:40 - 16:50
SEA
-
SOU
17h 10m
2 stops
Multiple Airlines Logo
06:45 - 20:40
SOU
-
SEA
21h 55m
3 stops
£748Multiple Airlines
Tue, 25 Aug - Tue, 1 Sep
Multiple Airlines Logo
19:10 - 08:45
SEA
-
SOU
29h 35m
2 stops
Multiple Airlines Logo
09:15 - 17:10
SOU
-
SEA
15h 55m
1 stop
£755Multiple Airlines
Tue, 15 Sep - Tue, 22 Sep
Aer Lingus Logo
19:10 - 08:40
SEA
-
SOU
29h 30m
1 stop
Aer Lingus Logo
09:20 - 17:10
SOU
-
SEA
15h 50m
1 stop
£757Aer Lingus
Sun, 30 Aug - Wed, 30 Sep
KLM Logo
14:35 - 17:00
SEA
-
SOU
18h 25m
1 stop
KLM Logo
17:30 - 11:47
SOU
-
SEA
26h 17m
1 stop
£762KLM
Mon, 2 Nov - Mon, 16 Nov
Virgin Atlantic Logo
06:00 - 08:10
SEA
-
SOU
18h 10m
2 stops
Virgin Atlantic Logo
17:30 - 16:51
SOU
-
SEA
31h 21m
2 stops
£773Virgin Atlantic
Mon, 2 Nov - Mon, 16 Nov
Delta Logo
17:45 - 16:50
SEA
-
SOU
15h 05m
1 stop
Delta Logo
09:05 - 16:35
SOU
-
SEA
15h 30m
1 stop
£807Delta
Wed, 7 Oct - Thu, 15 Oct
Delta Logo
09:45 - 16:50
SEA
-
SOU
23h 05m
2 stops
Delta Logo
17:20 - 11:52
SOU
-
SEA
26h 32m
1 stop
£810Delta
Wed, 7 Oct - Wed, 14 Oct
Delta Logo
13:50 - 17:35
SEA
-
SOU
19h 45m
1 stop
Delta Logo
09:05 - 23:20
SOU
-
SEA
22h 15m
2 stops
£814Delta
Tue, 25 Aug - Tue, 1 Sep

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Aer Lingus flights from Seattle to Southampton

Our best Aer Lingus deals on Seattle to Southampton flight tickets
Aer Lingus
30 Aug
SEA19:10Seattle/Tacoma Intl
29h 30m
1 stop
SOU08:40Southampton Eastleigh
30 Sept
SOU09:20Southampton Eastleigh
15h 50m
1 stop
SEA17:10Seattle/Tacoma Intl
£757
Aer Lingus
12 Sept
SEA19:10Seattle/Tacoma Intl
16h 20m
1 stop
SOU19:30Southampton Eastleigh
19 Sept
SOU09:20Southampton Eastleigh
15h 50m
1 stop
SEA17:10Seattle/Tacoma Intl
£1,132

KLM flights from Seattle to Southampton

Our best KLM deals on Seattle to Southampton flight tickets
KLM
2 Nov
SEA14:35Seattle/Tacoma Intl
18h 25m
1 stop
SOU17:00Southampton Eastleigh
16 Nov
SOU17:30Southampton Eastleigh
26h 17m
1 stop
SEA11:47Seattle/Tacoma Intl
£762
KLM
20 Nov
SEA14:35Seattle/Tacoma Intl
18h 25m
1 stop
SOU17:00Southampton Eastleigh
28 Nov
SOU09:25Southampton Eastleigh
19h 21m
2 stops
SEA20:46Seattle/Tacoma Intl
£1,004
KLM
20 Nov
SEA14:35Seattle/Tacoma Intl
18h 25m
1 stop
SOU17:00Southampton Eastleigh
28 Nov
SOU17:30Southampton Eastleigh
26h 17m
1 stop
SEA11:47Seattle/Tacoma Intl
£1,049

momondo Fare Finder

 
Customise your flight search to find flights from Seattle to Southampton 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 2 August 2026.
Use the filters below to find and compare flights from Seattle to Southampton that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 25/8

15:40-16:50

2 stops17h 10m

Southampton Eastleigh

Tue 1/9

09:15-17:55

2 stops16h 40m

£666

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 30/8

19:00-12:50

2 stops33h 50m

Southampton Eastleigh

Wed 30/9

09:20-17:10

1 stop15h 50m

£718

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 25/8

15:40-16:50

2 stops17h 10m

Southampton Eastleigh

Tue 1/9

06:45-20:40

3 stops21h 55m

£748

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 15/9

19:10-08:45

2 stops29h 35m

Southampton Eastleigh

Tue 22/9

09:15-17:10

1 stop15h 55m

£755

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 30/8

19:10-08:40

1 stop29h 30m

Southampton Eastleigh

Wed 30/9

09:20-17:10

1 stop15h 50m

£757

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 2/11

14:35-17:00

1 stop18h 25m

Southampton Eastleigh

Mon 16/11

17:30-11:47

1 stop26h 17m

£762

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 2/11

06:00-08:10

2 stops18h 10m

Southampton Eastleigh

Mon 16/11

17:30-16:51

2 stops31h 21m

£773
Fastest return journey

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 7/10

17:45-16:50

1 stop15h 05m

Southampton Eastleigh

Thu 15/10

09:05-16:35

1 stop15h 30m

£807

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 7/10

09:45-16:50

2 stops23h 05m

Southampton Eastleigh

Wed 14/10

17:20-11:52

1 stop26h 32m

£810

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 25/8

13:50-17:35

1 stop19h 45m

Southampton Eastleigh

Tue 1/9

09:05-23:20

2 stops22h 15m

£814

Flights are sorted by cheapest return 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 Southampton

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 Southampton Eastleigh?

Delta is the most popular carrier operating from Seattle/Tacoma Intl to Southampton Eastleigh

Which airlines fly to Southampton?

Virgin Atlantic, British Airways and Alaska Airlines are the top three most popular airlines that fly to Southampton from Seattle according to our data. Virgin Atlantic is the first choice among our users, with 62% of people opting to fly with this airline when travelling to Southampton. Keep in mind that there are 3 different airlines that fly to Southampton on a routine basis, so you have a few additional options to choose from.

When to book flights from Seattle to Southampton

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

Cheap Seattle to Southampton (SEA to SOU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Southampton

Fastest flight time

15h 05m

Direct flights

None
The fastest flight from Seattle to Southampton takes 15h 05m
There are no direct flights from Seattle to Southampton. There are no popular flight routes from Seattle to Southampton.
Search flight deals

Frequently asked questions about flying from Seattle to Southampton

  • How far is Seattle/Tacoma Intl to Southampton Eastleigh by plane?

    The distance between Seattle/Tacoma Intl and Southampton Eastleigh is about 4779.5 mi. 15h 05m is a normal flight duration for this route.

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

    Prices for flights from Seattle/Tacoma Intl Airport to Southampton Eastleigh Airport are updated daily.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Southampton Eastleigh Airport.

  • What documentation or ID do you need to fly to Southampton Eastleigh Airport?

    The required travel and health documents for your Southampton Eastleigh Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Southampton Eastleigh Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Portsmouth

Why use momondo?

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

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 Southampton from Seattle.

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

Yes. momondo enables you to select and highlight flights to Southampton from Seattle with this policy.

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

momondo provides multiple filters to help you find the best flight to Southampton from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Southampton from Seattle. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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