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Cheap flights from Seattle to London from £768

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 18/10. 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.
Multiple Airlines Logo
19:10 - 16:50
SEA
-
SOU
13h 40m
1 stop
Multiple Airlines Logo
09:20 - 18:26
SOU
-
SEA
41h 06m
2 stops
£768Multiple Airlines
Sun, 18 Oct - Sat, 7 Nov
KLM Logo
13:45 - 16:50
SEA
-
SOU
19h 05m
1 stop
KLM Logo
09:25 - 11:47
SOU
-
SEA
34h 22m
1 stop
£808KLM
Sun, 18 Oct - Sat, 7 Nov
Delta Logo
17:45 - 17:35
SEA
-
SOU
15h 50m
1 stop
Delta Logo
18:05 - 16:27
SOU
-
SEA
30h 22m
1 stop
£816Delta
Wed, 5 Aug - Thu, 20 Aug
Delta Logo
06:05 - 08:35
SEA
-
SOU
18h 30m
2 stops
Delta Logo
09:25 - 22:05
SOU
-
SEA
20h 40m
2 stops
£819Delta
Sun, 18 Oct - Sat, 7 Nov
Delta Logo
09:40 - 08:45
SEA
-
SOU
39h 05m
2 stops
Delta Logo
18:05 - 16:27
SOU
-
SEA
30h 22m
1 stop
£819Delta
Wed, 5 Aug - Tue, 18 Aug
Delta Logo
09:40 - 08:45
SEA
-
SOU
39h 05m
2 stops
Delta Logo
18:05 - 20:30
SOU
-
SEA
34h 25m
2 stops
£827Delta
Wed, 5 Aug - Tue, 18 Aug
Delta Logo
08:59 - 08:45
SEA
-
SOU
15h 46m
2 stops
Delta Logo
09:15 - 20:30
SOU
-
SEA
19h 15m
2 stops
£860Delta
Sun, 9 Aug - Wed, 19 Aug
Delta Logo
13:50 - 17:35
SEA
-
SOU
19h 45m
1 stop
Delta Logo
09:15 - 16:27
SOU
-
SEA
15h 12m
1 stop
£866Delta
Thu, 6 Aug - Tue, 18 Aug
Delta Logo
07:15 - 08:45
SEA
-
SOU
17h 30m
2 stops
Delta Logo
09:15 - 16:27
SOU
-
SEA
15h 12m
1 stop
£869Delta
Thu, 6 Aug - Tue, 18 Aug
Delta Logo
07:15 - 08:45
SEA
-
SOU
17h 30m
2 stops
Delta Logo
09:15 - 20:35
SOU
-
SEA
19h 20m
2 stops
£877Delta
Thu, 6 Aug - Tue, 18 Aug

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Delta flights from Seattle to Southampton

Our best Delta deals on Seattle to Southampton flight tickets
Delta
5 Aug
SEA17:45Seattle/Tacoma Intl
15h 50m
1 stop
SOU17:35Southampton Eastleigh
20 Aug
SOU18:05Southampton Eastleigh
30h 22m
1 stop
SEA16:27Seattle/Tacoma Intl
£816
Delta
18 Oct
SEA06:05Seattle/Tacoma Intl
18h 30m
2 stops
SOU08:35Southampton Eastleigh
7 Nov
SOU09:25Southampton Eastleigh
20h 40m
2 stops
SEA22:05Seattle/Tacoma Intl
£819
Delta
5 Aug
SEA09:40Seattle/Tacoma Intl
39h 05m
2 stops
SOU08:45Southampton Eastleigh
18 Aug
SOU18:05Southampton Eastleigh
30h 22m
1 stop
SEA16:27Seattle/Tacoma Intl
£819

Aer Lingus flights from Seattle to Southampton

Our best Aer Lingus deals on Seattle to Southampton flight tickets
Aer Lingus
28 Aug
SEA19:10Seattle/Tacoma Intl
13h 40m
1 stop
SOU16:50Southampton Eastleigh
7 Sept
SOU20:00Southampton Eastleigh
29h 10m
1 stop
SEA17:10Seattle/Tacoma Intl
£1,076
Aer Lingus
12 Jul
SEA19:10Seattle/Tacoma Intl
16h 20m
1 stop
SOU19:30Southampton Eastleigh
18 Jul
SOU20:00Southampton Eastleigh
29h 10m
1 stop
SEA17:10Seattle/Tacoma Intl
£1,140
Aer Lingus
12 Jul
SEA19:10Seattle/Tacoma Intl
13h 40m
1 stop
SOU16:50Southampton Eastleigh
18 Jul
SOU20:00Southampton Eastleigh
36h 52m
2 stops
SEA00:52Seattle/Tacoma Intl
£1,167

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 17 June 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 18/10

19:10-16:50

1 stop13h 40m

Southampton Eastleigh

Sat 7/11

09:20-18:26

2 stops41h 06m

£768

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 18/10

13:45-16:50

1 stop19h 05m

Southampton Eastleigh

Sat 7/11

09:25-11:47

1 stop34h 22m

£808

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 5/8

17:45-17:35

1 stop15h 50m

Southampton Eastleigh

Thu 20/8

18:05-16:27

1 stop30h 22m

£816

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 18/10

06:05-08:35

2 stops18h 30m

Southampton Eastleigh

Sat 7/11

09:25-22:05

2 stops20h 40m

£819

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 5/8

09:40-08:45

2 stops39h 05m

Southampton Eastleigh

Tue 18/8

18:05-16:27

1 stop30h 22m

£819

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 5/8

09:40-08:45

2 stops39h 05m

Southampton Eastleigh

Tue 18/8

18:05-20:30

2 stops34h 25m

£827

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 9/8

08:59-08:45

2 stops15h 46m

Southampton Eastleigh

Wed 19/8

09:15-20:30

2 stops19h 15m

£860

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 6/8

13:50-17:35

1 stop19h 45m

Southampton Eastleigh

Tue 18/8

09:15-16:27

1 stop15h 12m

£866
Fastest return journey

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 6/8

07:15-08:45

2 stops17h 30m

Southampton Eastleigh

Tue 18/8

09:15-16:27

1 stop15h 12m

£869

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 6/8

07:15-08:45

2 stops17h 30m

Southampton Eastleigh

Tue 18/8

09:15-20:35

2 stops19h 20m

£877

Flights are sorted by cheapest return flights first.

Showing 1-10 of 11 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?

Aer Lingus 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

13h 40m

Direct flights

None
The fastest flight from Seattle to Southampton takes 13h 40m
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. 13h 40m 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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