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Cheap flights from Seattle to London from $664

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 5/6. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
11:10 am - 8:35 am
SEA
-
SOU
37h 25m
2 stops
Delta Logo
5:20 pm - 4:35 pm
SOU
-
SEA
31h 15m
1 stop
$1,094Delta
Mon, Sep 14 - Sun, Sep 20
Delta Logo
11:10 am - 8:35 am
SEA
-
SOU
37h 25m
2 stops
Delta Logo
5:20 pm - 10:32 am
SOU
-
SEA
49h 12m
2 stops
$1,108Delta
Mon, Sep 14 - Sun, Sep 20
Delta Logo
5:40 pm - 8:35 am
SEA
-
SOU
30h 55m
1 stop
Delta Logo
5:20 pm - 4:35 pm
SOU
-
SEA
31h 15m
1 stop
$1,127Delta
Sat, Sep 12 - Sun, Sep 20
Delta Logo
12:00 pm - 8:35 am
SEA
-
SOU
36h 35m
2 stops
Delta Logo
5:20 pm - 4:35 pm
SOU
-
SEA
31h 15m
1 stop
$1,131Delta
Sat, Sep 12 - Sun, Sep 20
Delta Logo
12:00 pm - 8:35 am
SEA
-
SOU
36h 35m
2 stops
Delta Logo
5:20 pm - 7:00 pm
SOU
-
SEA
57h 40m
2 stops
$1,151Delta
Sat, Sep 12 - Sun, Sep 20
Delta Logo
5:40 pm - 8:35 am
SEA
-
SOU
30h 55m
1 stop
Delta Logo
5:20 pm - 4:35 pm
SOU
-
SEA
31h 15m
1 stop
$1,153Delta
Mon, Sep 14 - Sun, Sep 20
Delta Logo
7:20 am - 8:35 am
SEA
-
SOU
17h 15m
2 stops
Delta Logo
5:20 pm - 4:35 pm
SOU
-
SEA
31h 15m
1 stop
$1,157Delta
Sun, Sep 13 - Sun, Sep 20
KLM Logo
5:40 pm - 4:50 pm
SEA
-
SOU
15h 10m
1 stop
KLM Logo
9:05 am - 4:30 pm
SOU
-
SEA
15h 25m
1 stop
$1,165KLM
Thu, May 14 - Thu, May 21
Delta Logo
5:40 pm - 5:35 pm
SEA
-
SOU
15h 55m
1 stop
Delta Logo
6:05 pm - 10:33 pm
SOU
-
SEA
36h 28m
2 stops
$1,168Delta
Sun, Jul 5 - Tue, Jul 7
KLM Logo
5:40 pm - 8:45 am
SEA
-
SOU
31h 05m
1 stop
KLM Logo
9:05 am - 11:42 am
SOU
-
SEA
34h 37m
1 stop
$1,169KLM
Thu, May 14 - Thu, May 21

Aer Lingus flights from Seattle to Southampton

Our best Aer Lingus deals on Seattle to Southampton flight tickets
Aer Lingus
Sep 13
SEA7:10 pmSeattle/Tacoma Intl
16h 20m
1 stop
SOU7:30 pmSouthampton Eastleigh
Sep 27
SOU9:20 amSouthampton Eastleigh
15h 50m
1 stop
SEA5:10 pmSeattle/Tacoma Intl
$1,287
Aer Lingus
Sep 13
SEA7:10 pmSeattle/Tacoma Intl
16h 20m
1 stop
SOU7:30 pmSouthampton Eastleigh
Sep 27
SOU9:20 amSouthampton Eastleigh
15h 50m
1 stop
SEA5:10 pmSeattle/Tacoma Intl
$1,292
Aer Lingus
Sep 8
SEA7:10 pmSeattle/Tacoma Intl
13h 40m
1 stop
SOU4:50 pmSouthampton Eastleigh
Sep 18
SOU8:00 pmSouthampton Eastleigh
29h 10m
1 stop
SEA5:10 pmSeattle/Tacoma Intl
$1,301

British Airways flights from Seattle to Southampton

Our best British Airways deals on Seattle to Southampton flight tickets
British Airways
Apr 9
SEA8:20 pmSeattle/Tacoma Intl
29h 25m
2 stops
SOU9:45 amSouthampton Eastleigh
Apr 12
SOU9:20 amSouthampton Eastleigh
15h 50m
1 stop
SEA5:10 pmSeattle/Tacoma Intl
$5,603
British Airways
Apr 10
SEA7:10 pmSeattle/Tacoma Intl
13h 40m
1 stop
SOU4:50 pmSouthampton Eastleigh
Apr 20
SOU7:55 pmSouthampton Eastleigh
30h 30m
2 stops
SEA6:25 pmSeattle/Tacoma Intl
$17,839

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated April 2, 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 round-trip

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 9/14

11:10 am-8:35 am

2 stops37h 25m

Southampton Eastleigh

Sun 9/20

5:20 pm-4:35 pm

1 stop31h 15m

$1,094

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 9/14

11:10 am-8:35 am

2 stops37h 25m

Southampton Eastleigh

Sun 9/20

5:20 pm-10:32 am

2 stops49h 12m

$1,108

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 9/12

5:40 pm-8:35 am

1 stop30h 55m

Southampton Eastleigh

Sun 9/20

5:20 pm-4:35 pm

1 stop31h 15m

$1,127

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 9/12

12:00 pm-8:35 am

2 stops36h 35m

Southampton Eastleigh

Sun 9/20

5:20 pm-4:35 pm

1 stop31h 15m

$1,131

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 9/12

12:00 pm-8:35 am

2 stops36h 35m

Southampton Eastleigh

Sun 9/20

5:20 pm-7:00 pm

2 stops57h 40m

$1,151

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 9/14

5:40 pm-8:35 am

1 stop30h 55m

Southampton Eastleigh

Sun 9/20

5:20 pm-4:35 pm

1 stop31h 15m

$1,153

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 9/13

7:20 am-8:35 am

2 stops17h 15m

Southampton Eastleigh

Sun 9/20

5:20 pm-4:35 pm

1 stop31h 15m

$1,157
Quickest round-trip

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 5/14

5:40 pm-4:50 pm

1 stop15h 10m

Southampton Eastleigh

Thu 5/21

9:05 am-4:30 pm

1 stop15h 25m

$1,165

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 7/5

5:40 pm-5:35 pm

1 stop15h 55m

Southampton Eastleigh

Tue 7/7

6:05 pm-10:33 pm

2 stops36h 28m

$1,168

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 5/14

5:40 pm-8:45 am

1 stop31h 05m

Southampton Eastleigh

Thu 5/21

9:05 am-11:42 am

1 stop34h 37m

$1,169

Flights are sorted by cheapest round-trip 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

Can stopping save me money on Seattle to Southampton flights?

You could potentially save up to 26% on your flight if you consider stops on a Seattle to Southampton flight.

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 round-trip 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 10m

Direct flights

None
The fastest flight from Seattle to Southampton takes 15h 10m
There are no direct flights from Seattle to Southampton. There are no popular flight routes from Seattle to Southampton.
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Frequently asked questions about flying from Seattle to Southampton

  • How far is Seattle/Tacoma Intl to Southampton Eastleigh by plane?

    A flight from Seattle/Tacoma Intl to Southampton Eastleigh will travel around 4779.5 mi. 15h 10m 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?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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 travel and health documents you'll need for your trip to Southampton Eastleigh Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Southampton Eastleigh Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Traveling 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?

All flight searches from Seattle to Southampton on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Southampton?

Once all potential Seattle to Southampton flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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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