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Cheap flights from Seattle to London from £298

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 1/11. 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 return flights

Aer Lingus Logo
19:35 - 08:15SEA-SOU
28h 40m1 stop
Aer Lingus Logo
20:00 - 17:50SOU-SEA
29h 50m1 stop
£623Aer Lingus
Find Deal
Sun, 14 Sep - Wed, 24 Sep
Aer Lingus Logo
19:35 - 08:15SEA-SOU
28h 40m1 stop
Aer Lingus Logo
09:10 - 20:09SOU-SEA
18h 59m2 stops
£660Aer Lingus
Find Deal
Sun, 14 Sep - Wed, 24 Sep
Delta Logo
15:00 - 17:00SEA-SOU
18h 00m1 stop
Delta Logo
08:50 - 10:56SOU-SEA
34h 06m2 stops
£717Delta
Find Deal
Tue, 18 Nov - Thu, 27 Nov
Delta Logo
11:50 - 17:00SEA-SOU
21h 10m2 stops
Delta Logo
08:50 - 10:56SOU-SEA
34h 06m2 stops
£720Delta
Find Deal
Tue, 18 Nov - Thu, 27 Nov
Aer Lingus Logo
06:05 - 08:40SEA-SOU
18h 35m2 stops
Aer Lingus Logo
16:25 - 17:50SOU-SEA
33h 25m1 stop
£735Aer Lingus
Find Deal
Wed, 24 Sep - Sat, 11 Oct
Aer Lingus Logo
19:35 - 19:30SEA-SOU
15h 55m1 stop
Aer Lingus Logo
16:25 - 17:50SOU-SEA
33h 25m1 stop
£738Aer Lingus
Find Deal
Wed, 24 Sep - Sat, 11 Oct
Aer Lingus Logo
06:05 - 09:10SEA-SOU
19h 05m2 stops
Aer Lingus Logo
09:10 - 09:21SOU-SEA
32h 11m2 stops
£743Aer Lingus
Find Deal
Sun, 14 Sep - Wed, 24 Sep
Delta Logo
17:40 - 17:50SEA-SOU
16h 10m1 stop
Delta Logo
17:30 - 11:50SOU-SEA
26h 20m1 stop
£751Delta
Find Deal
Mon, 18 Aug - Wed, 24 Dec
Aer Lingus Logo
19:35 - 09:10SEA-SOU
29h 35m1 stop
Aer Lingus Logo
09:40 - 09:21SOU-SEA
31h 41m2 stops
£752Aer Lingus
Find Deal
Sat, 13 Sep - Sat, 20 Sep
KLM Logo
14:10 - 08:45SEA-SOU
34h 35m1 stop
KLM Logo
18:05 - 11:45SOU-SEA
25h 40m1 stop
£829KLM
Find Deal
Sat, 13 Sep - Sat, 20 Sep

Aer Lingus flights from Seattle to Southampton

Our best Aer Lingus deals on Seattle to Southampton flight tickets
Aer Lingus
14 Sept
SEA19:35Seattle/Tacoma Intl
28h 40m
1 stop
SOU08:15Southampton Eastleigh
24 Sept
SOU20:00Southampton Eastleigh
29h 50m
1 stop
SEA17:50Seattle/Tacoma Intl
£623
Find similar
Aer Lingus
14 Sept
SEA19:35Seattle/Tacoma Intl
28h 40m
1 stop
SOU08:15Southampton Eastleigh
24 Sept
SOU09:10Southampton Eastleigh
18h 59m
2 stops
SEA20:09Seattle/Tacoma Intl
£660
Find similar
Aer Lingus
24 Sept
SEA06:05Seattle/Tacoma Intl
18h 35m
2 stops
SOU08:40Southampton Eastleigh
11 Oct
SOU16:25Southampton Eastleigh
33h 25m
1 stop
SEA17:50Seattle/Tacoma Intl
£735
Find similar

Delta flights from Seattle to Southampton

Our best Delta deals on Seattle to Southampton flight tickets
Delta
18 Nov
SEA15:00Seattle/Tacoma Intl
18h 00m
1 stop
SOU17:00Southampton Eastleigh
27 Nov
SOU08:50Southampton Eastleigh
34h 06m
2 stops
SEA10:56Seattle/Tacoma Intl
£717
Find similar
Delta
18 Nov
SEA11:50Seattle/Tacoma Intl
21h 10m
2 stops
SOU17:00Southampton Eastleigh
27 Nov
SOU08:50Southampton Eastleigh
34h 06m
2 stops
SEA10:56Seattle/Tacoma Intl
£720
Find similar
Delta
18 Aug
SEA17:40Seattle/Tacoma Intl
16h 10m
1 stop
SOU17:50Southampton Eastleigh
24 Dec
SOU17:30Southampton Eastleigh
26h 20m
1 stop
SEA11:50Seattle/Tacoma Intl
£751
Find similar

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 1 August 2025.
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

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 14/9

19:35-08:15

1 stop28h 40m

Southampton Eastleigh

Wed 24/9

20:00-17:50

1 stop29h 50m

£623

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 14/9

19:35-08:15

1 stop28h 40m

Southampton Eastleigh

Wed 24/9

09:10-20:09

2 stops18h 59m

£660

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 18/11

15:00-17:00

1 stop18h 00m

Southampton Eastleigh

Thu 27/11

08:50-10:56

2 stops34h 06m

£717

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 18/11

11:50-17:00

2 stops21h 10m

Southampton Eastleigh

Thu 27/11

08:50-10:56

2 stops34h 06m

£720

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 24/9

06:05-08:40

2 stops18h 35m

Southampton Eastleigh

Sat 11/10

16:25-17:50

1 stop33h 25m

£735

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 24/9

19:35-19:30

1 stop15h 55m

Southampton Eastleigh

Sat 11/10

16:25-17:50

1 stop33h 25m

£738

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 14/9

06:05-09:10

2 stops19h 05m

Southampton Eastleigh

Wed 24/9

09:10-09:21

2 stops32h 11m

£743

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 18/8

17:40-17:50

1 stop16h 10m

Southampton Eastleigh

Wed 24/12

17:30-11:50

1 stop26h 20m

£751

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 13/9

19:35-09:10

1 stop29h 35m

Southampton Eastleigh

Sat 20/9

09:40-09:21

2 stops31h 41m

£752

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 13/9

14:10-08:45

1 stop34h 35m

Southampton Eastleigh

Sat 20/9

18:05-11:45

1 stop25h 40m

£829

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?

Aer Lingus, Delta, and KLM are the most popular carriers operating from Seattle/Tacoma Intl to Southampton Eastleigh

Which airlines fly to Southampton?

Virgin Atlantic, British Airways and Icelandair 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 54% 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

Best price found

£298

Fastest flight time

15h 20m

Direct flights

None

Airports in Southampton

1 airport
The best one-way flight to Southampton from Seattle in the past 72 hours is £298. The best return flight deal from Seattle to Southampton found on momondo in the last 72 hours is £623.
The fastest flight from Seattle to Southampton takes 15h 20m
There are no direct flights from Seattle to Southampton. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Southampton Eastleigh Airport.
There is 1 airport near Southampton: Southampton Eastleigh (SOU)
Search flight deals

  • 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 20m 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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