Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Seattle to London from $392

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 3/15. 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

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
5:30 pm - 8:35 am
SEA
-
SOU
31h 05m
1 stop
KLM Logo
5:20 pm - 11:45 am
SOU
-
SEA
26h 25m
1 stop
$771KLM
Tue, Mar 31 - Tue, Apr 7
Delta Logo
1:45 pm - 4:50 pm
SEA
-
SOU
19h 05m
1 stop
Delta Logo
9:05 am - 10:10 pm
SOU
-
SEA
21h 05m
2 stops
$781Delta
Tue, Mar 31 - Tue, Apr 7
Delta Logo
9:40 am - 4:50 pm
SEA
-
SOU
23h 10m
2 stops
Delta Logo
9:05 am - 10:10 pm
SOU
-
SEA
21h 05m
2 stops
$785Delta
Tue, Mar 31 - Tue, Apr 7
KLM Logo
1:45 pm - 8:45 am
SEA
-
SOU
35h 00m
1 stop
KLM Logo
9:05 am - 11:42 am
SOU
-
SEA
34h 37m
1 stop
$910KLM
Fri, May 15 - Thu, May 28
KLM Logo
1:45 pm - 8:45 am
SEA
-
SOU
35h 00m
1 stop
KLM Logo
9:05 am - 8:43 pm
SOU
-
SEA
19h 38m
2 stops
$920KLM
Fri, May 15 - Thu, May 28
Delta Logo
5:30 pm - 8:45 am
SEA
-
SOU
31h 15m
1 stop
Delta Logo
5:20 pm - 11:45 am
SOU
-
SEA
26h 25m
1 stop
$926Delta
Fri, Apr 3 - Mon, Apr 13
KLM Logo
1:45 pm - 4:50 pm
SEA
-
SOU
19h 05m
1 stop
KLM Logo
5:20 pm - 11:45 am
SOU
-
SEA
26h 25m
1 stop
$927KLM
Sun, Mar 29 - Sun, Apr 5
Delta Logo
10:25 pm - 8:45 am
SEA
-
SOU
26h 20m
2 stops
Delta Logo
5:20 pm - 4:30 pm
SOU
-
SEA
31h 10m
1 stop
$931Delta
Fri, Apr 3 - Mon, Apr 13
Delta Logo
11:25 am - 4:50 pm
SEA
-
SOU
21h 25m
2 stops
Delta Logo
9:15 am - 4:30 pm
SOU
-
SEA
15h 15m
1 stop
$932Delta
Sun, Mar 29 - Sun, Apr 5
Delta Logo
11:25 am - 4:50 pm
SEA
-
SOU
21h 25m
2 stops
Delta Logo
9:15 am - 12:03 am
SOU
-
SEA
22h 48m
2 stops
$942Delta
Sun, Mar 29 - Sun, Apr 5

Aer Lingus flights from Seattle to Southampton

Our best Aer Lingus deals on Seattle to Southampton flight tickets
Aer Lingus
May 15
SEA11:28 pmSeattle/Tacoma Intl
25h 07m
2 stops
SOU8:35 amSouthampton Eastleigh
May 28
SOU8:00 pmSouthampton Eastleigh
32h 33m
2 stops
SEA8:33 pmSeattle/Tacoma Intl
$1,090
Aer Lingus
Feb 27
SEA8:05 pmSeattle/Tacoma Intl
28h 40m
1 stop
SOU8:45 amSouthampton Eastleigh
Mar 5
SOU8:10 pmSouthampton Eastleigh
30h 10m
1 stop
SEA6:20 pmSeattle/Tacoma Intl
$1,162
Aer Lingus
Feb 27
SEA8:05 pmSeattle/Tacoma Intl
28h 40m
1 stop
SOU8:45 amSouthampton Eastleigh
Mar 5
SOU8:10 pmSouthampton Eastleigh
30h 10m
1 stop
SEA6:20 pmSeattle/Tacoma Intl
$1,167

KLM flights from Seattle to Southampton

Our best KLM deals on Seattle to Southampton flight tickets
KLM
Mar 31
SEA5:30 pmSeattle/Tacoma Intl
31h 05m
1 stop
SOU8:35 amSouthampton Eastleigh
Apr 7
SOU5:20 pmSouthampton Eastleigh
26h 25m
1 stop
SEA11:45 amSeattle/Tacoma Intl
$771
KLM
May 15
SEA1:45 pmSeattle/Tacoma Intl
35h 00m
1 stop
SOU8:45 amSouthampton Eastleigh
May 28
SOU9:05 amSouthampton Eastleigh
34h 37m
1 stop
SEA11:42 amSeattle/Tacoma Intl
$910
KLM
May 15
SEA1:45 pmSeattle/Tacoma Intl
35h 00m
1 stop
SOU8:45 amSouthampton Eastleigh
May 28
SOU9:05 amSouthampton Eastleigh
19h 38m
2 stops
SEA8:43 pmSeattle/Tacoma Intl
$920

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 February 15, 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

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 3/31

5:30 pm-8:35 am

1 stop31h 05m

Southampton Eastleigh

Tue 4/7

5:20 pm-11:45 am

1 stop26h 25m

$771

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 3/31

1:45 pm-4:50 pm

1 stop19h 05m

Southampton Eastleigh

Tue 4/7

9:05 am-10:10 pm

2 stops21h 05m

$781

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Tue 3/31

9:40 am-4:50 pm

2 stops23h 10m

Southampton Eastleigh

Tue 4/7

9:05 am-10:10 pm

2 stops21h 05m

$785

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/15

1:45 pm-8:45 am

1 stop35h 00m

Southampton Eastleigh

Thu 5/28

9:05 am-11:42 am

1 stop34h 37m

$910

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/15

1:45 pm-8:45 am

1 stop35h 00m

Southampton Eastleigh

Thu 5/28

9:05 am-8:43 pm

2 stops19h 38m

$920

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 4/3

5:30 pm-8:45 am

1 stop31h 15m

Southampton Eastleigh

Mon 4/13

5:20 pm-11:45 am

1 stop26h 25m

$926

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 3/29

1:45 pm-4:50 pm

1 stop19h 05m

Southampton Eastleigh

Sun 4/5

5:20 pm-11:45 am

1 stop26h 25m

$927

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 4/3

10:25 pm-8:45 am

2 stops26h 20m

Southampton Eastleigh

Mon 4/13

5:20 pm-4:30 pm

1 stop31h 10m

$931

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 3/29

11:25 am-4:50 pm

2 stops21h 25m

Southampton Eastleigh

Sun 4/5

9:15 am-4:30 pm

1 stop15h 15m

$932

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 3/29

11:25 am-4:50 pm

2 stops21h 25m

Southampton Eastleigh

Sun 4/5

9:15 am-12:03 am

2 stops22h 48m

$942

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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

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

17h 15m

Direct flights

None
The fastest flight from Seattle to Southampton takes 17h 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?

    A flight from Seattle/Tacoma Intl to Southampton Eastleigh will travel around 4779.5 mi. 17h 15m 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 3/17
Tue 3/24
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom