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Cheap flights from Seattle to London from £391

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 10/4. 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
0 bags
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Cheap return flights

Enter your travel dates to find the best prices.
Delta Logo
15:10 - 17:05
SEA
-
SOU
17h 55m1 stop
Delta Logo
17:35 - 11:50
SOU
-
SEA
26h 15m1 stop
£559Delta
Wed, 21 Jan - Wed, 28 Jan
Delta Logo
09:25 - 17:05
SEA
-
SOU
23h 40m2 stops
Delta Logo
17:35 - 11:50
SOU
-
SEA
26h 15m1 stop
£562Delta
Wed, 21 Jan - Wed, 28 Jan
Delta Logo
07:10 - 08:25
SEA
-
SOU
17h 15m2 stops
Delta Logo
09:25 - 21:49
SOU
-
SEA
20h 24m2 stops
£570Delta
Wed, 21 Jan - Wed, 28 Jan
Delta Logo
17:35 - 16:50
SEA
-
SOU
15h 15m1 stop
Delta Logo
17:20 - 15:50
SOU
-
SEA
30h 30m1 stop
£676Delta
Sun, 19 Apr - Thu, 30 Apr
Delta Logo
23:05 - 08:35
SEA
-
SOU
25h 30m2 stops
Delta Logo
09:05 - 15:50
SOU
-
SEA
14h 45m1 stop
£679Delta
Sat, 18 Apr - Thu, 30 Apr
Delta Logo
06:05 - 08:35
SEA
-
SOU
18h 30m2 stops
Delta Logo
17:20 - 20:28
SOU
-
SEA
35h 08m2 stops
£686Delta
Sun, 19 Apr - Mon, 4 May
Delta Logo
17:35 - 16:50
SEA
-
SOU
15h 15m1 stop
Delta Logo
17:20 - 11:35
SOU
-
SEA
26h 15m1 stop
£713Delta
Thu, 16 Apr - Mon, 4 May
Delta Logo
23:05 - 08:35
SEA
-
SOU
25h 30m2 stops
Delta Logo
09:15 - 15:50
SOU
-
SEA
14h 35m1 stop
£716Delta
Sat, 18 Apr - Sat, 2 May
Delta Logo
07:20 - 08:45
SEA
-
SOU
17h 25m2 stops
Delta Logo
09:05 - 20:41
SOU
-
SEA
19h 36m2 stops
£724Delta
Fri, 8 May - Thu, 21 May
Delta Logo
17:35 - 08:35
SEA
-
SOU
31h 00m1 stop
Delta Logo
09:05 - 15:50
SOU
-
SEA
14h 45m1 stop
£739Delta
Wed, 13 May - Fri, 22 May

Delta flights from Seattle to Southampton

Our best Delta deals on Seattle to Southampton flight tickets
Delta
21 Jan
SEA15:10Seattle/Tacoma Intl
17h 55m
1 stop
SOU17:05Southampton Eastleigh
28 Jan
SOU17:35Southampton Eastleigh
26h 15m
1 stop
SEA11:50Seattle/Tacoma Intl
£559
Find similar
Delta
21 Jan
SEA09:25Seattle/Tacoma Intl
23h 40m
2 stops
SOU17:05Southampton Eastleigh
28 Jan
SOU17:35Southampton Eastleigh
26h 15m
1 stop
SEA11:50Seattle/Tacoma Intl
£562
Find similar
Delta
21 Jan
SEA07:10Seattle/Tacoma Intl
17h 15m
2 stops
SOU08:25Southampton Eastleigh
28 Jan
SOU09:25Southampton Eastleigh
20h 24m
2 stops
SEA21:49Seattle/Tacoma Intl
£570
Find similar

British Airways flights from Seattle to Southampton

Our best British Airways deals on Seattle to Southampton flight tickets
British Airways
6 Apr
SEA20:20Seattle/Tacoma Intl
15h 05m
2 stops
SOU19:25Southampton Eastleigh
21 Apr
SOU09:10Southampton Eastleigh
15h 49m
1 stop
SEA16:59Seattle/Tacoma Intl
£4,026
Find similar
British Airways
10 May
SEA13:35Seattle/Tacoma Intl
21h 50m
2 stops
SOU19:25Southampton Eastleigh
24 May
SOU09:10Southampton Eastleigh
15h 49m
1 stop
SEA16:59Seattle/Tacoma Intl
£4,035
Find similar
British Airways
21 Dec
SEA18:50Seattle/Tacoma Intl
35h 30m
3 stops
SOU14:20Southampton Eastleigh
24 Dec
SOU12:25Southampton Eastleigh
36h 30m
2 stops
SEA16:55Seattle/Tacoma Intl
£12,498
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 8 December 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

Wed 21/1

15:10-17:05

1 stop17h 55m

Southampton Eastleigh

Wed 28/1

17:35-11:50

1 stop26h 15m

£559

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 21/1

09:25-17:05

2 stops23h 40m

Southampton Eastleigh

Wed 28/1

17:35-11:50

1 stop26h 15m

£562

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 21/1

07:10-08:25

2 stops17h 15m

Southampton Eastleigh

Wed 28/1

09:25-21:49

2 stops20h 24m

£570

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 19/4

17:35-16:50

1 stop15h 15m

Southampton Eastleigh

Thu 30/4

17:20-15:50

1 stop30h 30m

£676

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 18/4

23:05-08:35

2 stops25h 30m

Southampton Eastleigh

Thu 30/4

09:05-15:50

1 stop14h 45m

£679

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 19/4

06:05-08:35

2 stops18h 30m

Southampton Eastleigh

Mon 4/5

17:20-20:28

2 stops35h 08m

£686

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 16/4

17:35-16:50

1 stop15h 15m

Southampton Eastleigh

Mon 4/5

17:20-11:35

1 stop26h 15m

£713

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 18/4

23:05-08:35

2 stops25h 30m

Southampton Eastleigh

Sat 2/5

09:15-15:50

1 stop14h 35m

£716

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 8/5

07:20-08:45

2 stops17h 25m

Southampton Eastleigh

Thu 21/5

09:05-20:41

2 stops19h 36m

£724

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 13/5

17:35-08:35

1 stop31h 00m

Southampton Eastleigh

Fri 22/5

09:05-15:50

1 stop14h 45m

£739

Flights are sorted by cheapest return flights first.

Showing 1-10 of 13 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?

KLM is the most popular carrier 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 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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