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Cheap flights from Seattle to London from £506

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 7/6. 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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Find the cheapest flights from Seattle to London

Cheap return flights

Enter your travel dates to find the best prices.
Delta Logo
22:00 - 08:35
SEA
-
SOU
26h 35m
2 stops
Delta Logo
09:05 - 16:35
SOU
-
SEA
15h 30m
1 stop
£768Delta
Mon, 31 Aug - Thu, 17 Sep
Delta Logo
22:00 - 08:35
SEA
-
SOU
26h 35m
2 stops
Delta Logo
09:05 - 23:26
SOU
-
SEA
22h 21m
2 stops
£775Delta
Mon, 31 Aug - Tue, 15 Sep
Delta Logo
21:25 - 16:50
SEA
-
SOU
35h 25m
2 stops
Delta Logo
17:20 - 11:47
SOU
-
SEA
26h 27m
1 stop
£789Delta
Sun, 30 Aug - Tue, 15 Sep
Delta Logo
21:25 - 16:50
SEA
-
SOU
35h 25m
2 stops
Delta Logo
17:20 - 16:52
SOU
-
SEA
31h 32m
2 stops
£792Delta
Sun, 30 Aug - Mon, 14 Sep
Delta Logo
13:50 - 08:35
SEA
-
SOU
34h 45m
1 stop
Delta Logo
09:05 - 16:35
SOU
-
SEA
15h 30m
1 stop
£802Delta
Sun, 13 Sep - Wed, 16 Sep
Delta Logo
22:00 - 08:35
SEA
-
SOU
26h 35m
2 stops
Delta Logo
17:20 - 11:47
SOU
-
SEA
26h 27m
1 stop
£805Delta
Mon, 31 Aug - Sat, 19 Sep
Delta Logo
17:45 - 08:35
SEA
-
SOU
30h 50m
2 stops
Delta Logo
17:20 - 11:47
SOU
-
SEA
26h 27m
1 stop
£806Delta
Sun, 13 Sep - Wed, 16 Sep
Delta Logo
07:20 - 08:45
SEA
-
SOU
17h 25m
2 stops
Delta Logo
17:20 - 16:55
SOU
-
SEA
31h 35m
2 stops
£812Delta
Sat, 12 Sep - Thu, 17 Sep
Delta Logo
13:50 - 08:35
SEA
-
SOU
34h 45m
1 stop
Delta Logo
17:20 - 16:35
SOU
-
SEA
31h 15m
1 stop
£824Delta
Sun, 13 Sep - Sun, 20 Sep
Delta Logo
17:45 - 17:35
SEA
-
SOU
15h 50m
1 stop
Delta Logo
09:05 - 16:35
SOU
-
SEA
15h 30m
1 stop
£825Delta
Thu, 27 Aug - Wed, 16 Sep

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Delta flights from Seattle to Southampton

Our best Delta deals on Seattle to Southampton flight tickets
Delta
31 Aug
SEA22:00Seattle/Tacoma Intl
26h 35m
2 stops
SOU08:35Southampton Eastleigh
17 Sept
SOU09:05Southampton Eastleigh
15h 30m
1 stop
SEA16:35Seattle/Tacoma Intl
£768
Delta
31 Aug
SEA22:00Seattle/Tacoma Intl
26h 35m
2 stops
SOU08:35Southampton Eastleigh
15 Sept
SOU09:05Southampton Eastleigh
22h 21m
2 stops
SEA23:26Seattle/Tacoma Intl
£775
Delta
30 Aug
SEA21:25Seattle/Tacoma Intl
35h 25m
2 stops
SOU16:50Southampton Eastleigh
15 Sept
SOU17:20Southampton Eastleigh
26h 27m
1 stop
SEA11:47Seattle/Tacoma Intl
£789

British Airways flights from Seattle to Southampton

Our best British Airways deals on Seattle to Southampton flight tickets
British Airways
12 May
SEA13:30Seattle/Tacoma Intl
21h 55m
2 stops
SOU19:25Southampton Eastleigh
16 May
SOU09:20Southampton Eastleigh
15h 50m
1 stop
SEA17:10Seattle/Tacoma Intl
£4,146
British Airways
4 May
SEA20:20Seattle/Tacoma Intl
15h 05m
2 stops
SOU19:25Southampton Eastleigh
12 May
SOU09:20Southampton Eastleigh
15h 50m
1 stop
SEA17:10Seattle/Tacoma Intl
£4,147
British Airways
12 May
SEA20:20Seattle/Tacoma Intl
15h 05m
2 stops
SOU19:25Southampton Eastleigh
16 May
SOU06:45Southampton Eastleigh
19h 40m
2 stops
SEA18:25Seattle/Tacoma Intl
£4,547

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 30 April 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

Mon 31/8

22:00-08:35

2 stops26h 35m

Southampton Eastleigh

Thu 17/9

09:05-16:35

1 stop15h 30m

£768

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 31/8

22:00-08:35

2 stops26h 35m

Southampton Eastleigh

Tue 15/9

09:05-23:26

2 stops22h 21m

£775

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 30/8

21:25-16:50

2 stops35h 25m

Southampton Eastleigh

Tue 15/9

17:20-11:47

1 stop26h 27m

£789

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 30/8

21:25-16:50

2 stops35h 25m

Southampton Eastleigh

Mon 14/9

17:20-16:52

2 stops31h 32m

£792

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 13/9

13:50-08:35

1 stop34h 45m

Southampton Eastleigh

Wed 16/9

09:05-16:35

1 stop15h 30m

£802

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 31/8

22:00-08:35

2 stops26h 35m

Southampton Eastleigh

Sat 19/9

17:20-11:47

1 stop26h 27m

£805

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 13/9

17:45-08:35

2 stops30h 50m

Southampton Eastleigh

Wed 16/9

17:20-11:47

1 stop26h 27m

£806

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 12/9

07:20-08:45

2 stops17h 25m

Southampton Eastleigh

Thu 17/9

17:20-16:55

2 stops31h 35m

£812

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 13/9

13:50-08:35

1 stop34h 45m

Southampton Eastleigh

Sun 20/9

17:20-16:35

1 stop31h 15m

£824
Fastest return journey

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 27/8

17:45-17:35

1 stop15h 50m

Southampton Eastleigh

Wed 16/9

09:05-16:35

1 stop15h 30m

£825

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

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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