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Cheap flights from Seattle to London from £224

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 21/4. 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
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Find the cheapest flights from Seattle to London

Cheap return flights

Enter your travel dates to find the best prices.
Delta Logo
13:50 - 16:50
SEA
-
SOU
19h 00m
1 stop
Delta Logo
17:20 - 11:47
SOU
-
SEA
26h 27m
1 stop
£719Delta
Sun, 30 Aug - Wed, 16 Sep
Delta Logo
09:30 - 16:50
SEA
-
SOU
23h 20m
2 stops
Delta Logo
09:05 - 16:35
SOU
-
SEA
15h 30m
1 stop
£722Delta
Mon, 31 Aug - Wed, 16 Sep
Delta Logo
21:25 - 16:50
SEA
-
SOU
35h 25m
2 stops
Delta Logo
09:05 - 11:47
SOU
-
SEA
34h 42m
1 stop
£731Delta
Sun, 30 Aug - Tue, 15 Sep
Multiple Airlines Logo
15:40 - 17:40
SEA
-
SOU
18h 00m
2 stops
Multiple Airlines Logo
17:20 - 17:10
SOU
-
SEA
31h 50m
1 stop
£752Multiple Airlines
Sun, 26 Apr - Sun, 3 May
Delta Logo
13:50 - 08:35
SEA
-
SOU
34h 45m
1 stop
Delta Logo
17:20 - 11:47
SOU
-
SEA
26h 27m
1 stop
£757Delta
Sun, 30 Aug - Sun, 13 Sep
Delta Logo
07:20 - 16:50
SEA
-
SOU
25h 30m
2 stops
Delta Logo
17:20 - 11:47
SOU
-
SEA
26h 27m
1 stop
£760Delta
Mon, 31 Aug - Sun, 13 Sep
KLM Logo
13:45 - 08:35
SEA
-
SOU
34h 50m
1 stop
KLM Logo
09:05 - 16:24
SOU
-
SEA
15h 19m
1 stop
£764KLM
Wed, 13 May - Wed, 3 Jun
KLM Logo
17:40 - 08:35
SEA
-
SOU
30h 55m
1 stop
KLM Logo
09:05 - 11:37
SOU
-
SEA
34h 32m
1 stop
£764KLM
Wed, 13 May - Wed, 3 Jun
Delta Logo
05:30 - 08:35
SEA
-
SOU
19h 05m
2 stops
Delta Logo
09:05 - 16:24
SOU
-
SEA
15h 19m
1 stop
£767Delta
Wed, 13 May - Wed, 3 Jun
Delta Logo
17:45 - 08:35
SEA
-
SOU
30h 50m
1 stop
Delta Logo
17:20 - 11:47
SOU
-
SEA
26h 27m
1 stop
£768Delta
Mon, 31 Aug - Wed, 16 Sep

Delta flights from Seattle to Southampton

Our best Delta deals on Seattle to Southampton flight tickets
Delta
30 Aug
SEA13:50Seattle/Tacoma Intl
19h 00m
1 stop
SOU16:50Southampton Eastleigh
15 Sept
SOU17:20Southampton Eastleigh
31h 15m
1 stop
SEA16:35Seattle/Tacoma Intl
£719
Delta
30 Aug
SEA07:20Seattle/Tacoma Intl
17h 15m
2 stops
SOU08:35Southampton Eastleigh
16 Sept
SOU09:05Southampton Eastleigh
15h 30m
1 stop
SEA16:35Seattle/Tacoma Intl
£722
Delta
29 Apr
SEA11:10Seattle/Tacoma Intl
21h 40m
2 stops
SOU16:50Southampton Eastleigh
6 May
SOU09:05Southampton Eastleigh
15h 25m
1 stop
SEA16:30Seattle/Tacoma Intl
£754

KLM flights from Seattle to Southampton

Our best KLM deals on Seattle to Southampton flight tickets
KLM
29 Apr
SEA13:50Seattle/Tacoma Intl
34h 45m
1 stop
SOU08:35Southampton Eastleigh
6 May
SOU09:05Southampton Eastleigh
15h 25m
1 stop
SEA16:30Seattle/Tacoma Intl
£751
KLM
13 May
SEA13:45Seattle/Tacoma Intl
34h 50m
1 stop
SOU08:35Southampton Eastleigh
3 Jun
SOU09:05Southampton Eastleigh
15h 19m
1 stop
SEA16:24Seattle/Tacoma Intl
£764
KLM
13 May
SEA17:40Seattle/Tacoma Intl
30h 55m
1 stop
SOU08:35Southampton Eastleigh
3 Jun
SOU09:05Southampton Eastleigh
34h 32m
1 stop
SEA11:37Seattle/Tacoma Intl
£764

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 15 March 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

Sun 30/8

13:50-16:50

1 stop19h 00m

Southampton Eastleigh

Wed 16/9

17:20-11:47

1 stop26h 27m

£719

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 31/8

09:30-16:50

2 stops23h 20m

Southampton Eastleigh

Wed 16/9

09:05-16:35

1 stop15h 30m

£722

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 30/8

21:25-16:50

2 stops35h 25m

Southampton Eastleigh

Tue 15/9

09:05-11:47

1 stop34h 42m

£731

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 26/4

15:40-17:40

2 stops18h 00m

Southampton Eastleigh

Sun 3/5

17:20-17:10

1 stop31h 50m

£752

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 30/8

13:50-08:35

1 stop34h 45m

Southampton Eastleigh

Sun 13/9

17:20-11:47

1 stop26h 27m

£757

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 31/8

07:20-16:50

2 stops25h 30m

Southampton Eastleigh

Sun 13/9

17:20-11:47

1 stop26h 27m

£760

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 13/5

13:45-08:35

1 stop34h 50m

Southampton Eastleigh

Wed 3/6

09:05-16:24

1 stop15h 19m

£764

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 13/5

17:40-08:35

1 stop30h 55m

Southampton Eastleigh

Wed 3/6

09:05-11:37

1 stop34h 32m

£764
Fastest return journey

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 13/5

05:30-08:35

2 stops19h 05m

Southampton Eastleigh

Wed 3/6

09:05-16:24

1 stop15h 19m

£767

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 31/8

17:45-08:35

1 stop30h 50m

Southampton Eastleigh

Wed 16/9

17:20-11:47

1 stop26h 27m

£768

Flights are sorted by cheapest return 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 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 and Aer Lingus are the most popular carriers operating from Seattle/Tacoma Intl to Southampton Eastleigh

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 15m

Direct flights

None
The fastest flight from Seattle to Southampton takes 15h 15m
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 15m 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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