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Cheap flights from Seattle to London from $843

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 8/16. 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

Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:40 pm - 7:30 pm
SEA
-
SOU
19h 50m
2 stops
Multiple Airlines Logo
9:20 am - 11:45 am
SOU
-
SEA
34h 25m
2 stops
$843Multiple Airlines
Sun, Aug 16 - Mon, Aug 24
Multiple Airlines Logo
3:40 pm - 7:30 pm
SEA
-
SOU
19h 50m
2 stops
Multiple Airlines Logo
9:20 am - 11:45 am
SOU
-
SEA
34h 25m
2 stops
$861Multiple Airlines
Sun, Aug 16 - Mon, Aug 24
Multiple Airlines Logo
3:40 pm - 7:30 pm
SEA
-
SOU
19h 50m
2 stops
Multiple Airlines Logo
9:20 am - 11:45 am
SOU
-
SEA
34h 25m
2 stops
$877Multiple Airlines
Sun, Aug 16 - Mon, Aug 24
Multiple Airlines Logo
3:40 pm - 8:45 am
SEA
-
SOU
33h 05m
3 stops
Multiple Airlines Logo
9:20 am - 11:45 am
SOU
-
SEA
34h 25m
2 stops
$896Multiple Airlines
Sun, Aug 16 - Mon, Aug 24
Aer Lingus Logo
7:10 pm - 7:30 pm
SEA
-
SOU
16h 20m
1 stop
Aer Lingus Logo
9:20 am - 5:10 pm
SOU
-
SEA
15h 50m
1 stop
$933Aer Lingus
Sun, Aug 16 - Mon, Aug 24
Aer Lingus Logo
7:10 pm - 7:30 pm
SEA
-
SOU
16h 20m
1 stop
Aer Lingus Logo
9:20 am - 5:10 pm
SOU
-
SEA
15h 50m
1 stop
$962Aer Lingus
Sun, Aug 16 - Mon, Aug 24
Aer Lingus Logo
7:10 pm - 7:30 pm
SEA
-
SOU
16h 20m
1 stop
Aer Lingus Logo
9:20 am - 5:10 pm
SOU
-
SEA
15h 50m
1 stop
$969Aer Lingus
Sun, Aug 16 - Mon, Aug 24
Multiple Airlines Logo
8:00 am - 7:30 pm
SEA
-
SOU
27h 30m
3 stops
Multiple Airlines Logo
8:00 pm - 11:55 am
SOU
-
SEA
23h 55m
2 stops
$985Multiple Airlines
Sun, Aug 16 - Mon, Aug 24
Multiple Airlines Logo
9:45 pm - 8:25 am
SEA
-
SOU
50h 40m
2 stops
Multiple Airlines Logo
9:20 am - 5:10 pm
SOU
-
SEA
15h 50m
1 stop
$991Multiple Airlines
Sun, Aug 16 - Mon, Aug 24
Multiple Airlines Logo
8:00 am - 7:30 pm
SEA
-
SOU
27h 30m
3 stops
Multiple Airlines Logo
8:00 pm - 6:32 pm
SOU
-
SEA
30h 32m
3 stops
$992Multiple Airlines
Sun, Aug 16 - Mon, Aug 24

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Aer Lingus flights from Seattle to Southampton

Our best Aer Lingus deals on Seattle to Southampton flight tickets
Aer Lingus
Aug 16
SEA7:10 pmSeattle/Tacoma Intl
16h 20m
1 stop
SOU7:30 pmSouthampton Eastleigh
Aug 24
SOU9:20 amSouthampton Eastleigh
15h 50m
1 stop
SEA5:10 pmSeattle/Tacoma Intl
$933
Aer Lingus
Aug 16
SEA7:10 pmSeattle/Tacoma Intl
16h 20m
1 stop
SOU7:30 pmSouthampton Eastleigh
Aug 24
SOU9:20 amSouthampton Eastleigh
15h 50m
1 stop
SEA5:10 pmSeattle/Tacoma Intl
$962
Aer Lingus
Aug 16
SEA7:10 pmSeattle/Tacoma Intl
16h 20m
1 stop
SOU7:30 pmSouthampton Eastleigh
Aug 24
SOU9:20 amSouthampton Eastleigh
15h 50m
1 stop
SEA5:10 pmSeattle/Tacoma Intl
$969

Delta flights from Seattle to Southampton

Our best Delta deals on Seattle to Southampton flight tickets
Delta
Nov 29
SEA2:35 pmSeattle/Tacoma Intl
33h 35m
1 stop
SOU8:10 amSouthampton Eastleigh
Dec 8
SOU5:30 pmSouthampton Eastleigh
26h 20m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$1,028
Delta
Oct 4
SEA5:45 pmSeattle/Tacoma Intl
15h 05m
1 stop
SOU4:50 pmSouthampton Eastleigh
Oct 20
SOU9:05 amSouthampton Eastleigh
15h 30m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$1,030
Delta
Nov 30
SEA7:20 amSeattle/Tacoma Intl
25h 40m
2 stops
SOU5:00 pmSouthampton Eastleigh
Dec 7
SOU5:30 pmSouthampton Eastleigh
26h 20m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$1,033

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 July 6, 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

Sun 8/16

3:40 pm-7:30 pm

2 stops19h 50m

Southampton Eastleigh

Mon 8/24

9:20 am-11:45 am

2 stops34h 25m

$843

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

3:40 pm-7:30 pm

2 stops19h 50m

Southampton Eastleigh

Mon 8/24

9:20 am-11:45 am

2 stops34h 25m

$861

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

3:40 pm-7:30 pm

2 stops19h 50m

Southampton Eastleigh

Mon 8/24

9:20 am-11:45 am

2 stops34h 25m

$877

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

3:40 pm-8:45 am

3 stops33h 05m

Southampton Eastleigh

Mon 8/24

9:20 am-11:45 am

2 stops34h 25m

$896
Quickest round-trip

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

7:10 pm-7:30 pm

1 stop16h 20m

Southampton Eastleigh

Mon 8/24

9:20 am-5:10 pm

1 stop15h 50m

$933

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

7:10 pm-7:30 pm

1 stop16h 20m

Southampton Eastleigh

Mon 8/24

9:20 am-5:10 pm

1 stop15h 50m

$962

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

7:10 pm-7:30 pm

1 stop16h 20m

Southampton Eastleigh

Mon 8/24

9:20 am-5:10 pm

1 stop15h 50m

$969

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

8:00 am-7:30 pm

3 stops27h 30m

Southampton Eastleigh

Mon 8/24

8:00 pm-11:55 am

2 stops23h 55m

$985

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

9:45 pm-8:25 am

2 stops50h 40m

Southampton Eastleigh

Mon 8/24

9:20 am-5:10 pm

1 stop15h 50m

$991

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 8/16

8:00 am-7:30 pm

3 stops27h 30m

Southampton Eastleigh

Mon 8/24

8:00 pm-6:32 pm

3 stops30h 32m

$992

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 32% 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 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?

    A flight from Seattle/Tacoma Intl to Southampton Eastleigh will travel around 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?

    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.

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