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Cheap flights from Seattle to London from £392

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 29/3. 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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Cheap return flights

Enter your travel dates to find the best prices.
Delta Logo
16:00 - 08:10SEA-SOU
33h 10m1 stop
Delta Logo
08:40 - 12:35SOU-SEA
34h 55m1 stop
£633Delta
Find Deal
Mon, 16 Mar - Wed, 25 Mar
Delta Logo
16:00 - 08:10SEA-SOU
33h 10m1 stop
Delta Logo
08:40 - 23:35SOU-SEA
21h 55m2 stops
£640Delta
Find Deal
Mon, 16 Mar - Wed, 25 Mar
Delta Logo
23:05 - 08:20SEA-SOU
26h 15m2 stops
Delta Logo
17:30 - 12:35SOU-SEA
26h 05m1 stop
£651Delta
Find Deal
Sat, 14 Mar - Wed, 25 Mar
Delta Logo
23:05 - 08:20SEA-SOU
26h 15m2 stops
Delta Logo
08:40 - 17:00SOU-SEA
39h 20m2 stops
£659Delta
Find Deal
Sat, 14 Mar - Tue, 24 Mar
KLM Logo
15:00 - 17:00SEA-SOU
18h 00m1 stop
KLM Logo
08:40 - 22:23SOU-SEA
21h 43m2 stops
£694KLM
Find Deal
Tue, 11 Nov - Fri, 28 Nov
KLM Logo
06:00 - 08:10SEA-SOU
18h 10m2 stops
KLM Logo
08:40 - 22:23SOU-SEA
21h 43m2 stops
£697KLM
Find Deal
Tue, 11 Nov - Fri, 28 Nov
KLM Logo
15:00 - 17:00SEA-SOU
18h 00m1 stop
KLM Logo
17:30 - 11:45SOU-SEA
26h 15m1 stop
£963KLM
Find Deal
Tue, 11 Nov - Fri, 28 Nov
British Airways Logo
20:05 - 19:40SEA-SOU
15h 35m1 stop
British Airways Logo
19:40 - 16:55SOU-SEA
29h 15m2 stops
£1,078British Airways
Find Deal
Wed, 19 Nov - Tue, 9 Dec
British Airways Logo
14:35 - 18:30SEA-SOU
20h 55m2 stops
British Airways Logo
20:10 - 19:20SOU-SEA
30h 10m1 stop
£1,079British Airways
Find Deal
Sat, 14 Mar - Thu, 26 Mar
British Airways Logo
21:05 - 11:55SEA-SOU
31h 50m1 stop
British Airways Logo
18:00 - 12:30SOU-SEA
25h 30m2 stops
£1,083British Airways
Find Deal
Mon, 16 Mar - Thu, 26 Mar

Delta flights from Seattle to Southampton

Our best Delta deals on Seattle to Southampton flight tickets
Delta
16 Mar
SEA16:00Seattle/Tacoma Intl
33h 10m
1 stop
SOU08:10Southampton Eastleigh
25 Mar
SOU08:40Southampton Eastleigh
34h 55m
1 stop
SEA12:35Seattle/Tacoma Intl
£633
Find similar
Delta
16 Mar
SEA16:00Seattle/Tacoma Intl
33h 10m
1 stop
SOU08:10Southampton Eastleigh
25 Mar
SOU08:40Southampton Eastleigh
21h 55m
2 stops
SEA23:35Seattle/Tacoma Intl
£640
Find similar
Delta
14 Mar
SEA23:05Seattle/Tacoma Intl
26h 15m
2 stops
SOU08:20Southampton Eastleigh
25 Mar
SOU17:30Southampton Eastleigh
26h 05m
1 stop
SEA12:35Seattle/Tacoma Intl
£651
Find similar

KLM flights from Seattle to Southampton

Our best KLM deals on Seattle to Southampton flight tickets
KLM
11 Nov
SEA15:00Seattle/Tacoma Intl
18h 00m
1 stop
SOU17:00Southampton Eastleigh
28 Nov
SOU08:40Southampton Eastleigh
21h 43m
2 stops
SEA22:23Seattle/Tacoma Intl
£694
Find similar
KLM
11 Nov
SEA06:00Seattle/Tacoma Intl
18h 10m
2 stops
SOU08:10Southampton Eastleigh
28 Nov
SOU08:40Southampton Eastleigh
21h 43m
2 stops
SEA22:23Seattle/Tacoma Intl
£697
Find similar
KLM
11 Nov
SEA15:00Seattle/Tacoma Intl
18h 00m
1 stop
SOU17:00Southampton Eastleigh
28 Nov
SOU17:30Southampton Eastleigh
26h 15m
1 stop
SEA11:45Seattle/Tacoma Intl
£963
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 20 October 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

Mon 16/3

16:00-08:10

1 stop33h 10m

Southampton Eastleigh

Wed 25/3

08:40-12:35

1 stop34h 55m

£633

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 16/3

16:00-08:10

1 stop33h 10m

Southampton Eastleigh

Wed 25/3

08:40-23:35

2 stops21h 55m

£640

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 14/3

23:05-08:20

2 stops26h 15m

Southampton Eastleigh

Wed 25/3

17:30-12:35

1 stop26h 05m

£651

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 14/3

23:05-08:20

2 stops26h 15m

Southampton Eastleigh

Tue 24/3

08:40-17:00

2 stops39h 20m

£659

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 11/11

15:00-17:00

1 stop18h 00m

Southampton Eastleigh

Fri 28/11

08:40-22:23

2 stops21h 43m

£694

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 11/11

06:00-08:10

2 stops18h 10m

Southampton Eastleigh

Fri 28/11

08:40-22:23

2 stops21h 43m

£697

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 11/11

15:00-17:00

1 stop18h 00m

Southampton Eastleigh

Fri 28/11

17:30-11:45

1 stop26h 15m

£963

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 19/11

20:05-19:40

1 stop15h 35m

Southampton Eastleigh

Tue 9/12

19:40-16:55

2 stops29h 15m

£1,078

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 14/3

14:35-18:30

2 stops20h 55m

Southampton Eastleigh

Thu 26/3

20:10-19:20

1 stop30h 10m

£1,079

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 16/3

21:05-11:55

1 stop31h 50m

Southampton Eastleigh

Thu 26/3

18:00-12:30

2 stops25h 30m

£1,083

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 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 Aer Lingus 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 65% 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

Direct flights

None
There are no direct flights from Seattle to Southampton. There are no popular flight routes from Seattle to Southampton.
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 35m 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.

An easier way to manage your Southampton trip

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