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$571+ Cheap flights from Seattle (SEA) to Southampton (SOU)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SOU
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheap flight deals from Seattle to Southampton

Cheapest flights from Seattle to Southampton
Explore the most affordable flight options available from Seattle to Southampton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This Delta deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/129:40 am
SEA
-
SOU
2 stops24h 20m
Delta
Thu 3/198:50 am
SOU
-
SEA
2 stops20h 25m
Delta
Deal found 1/26$767
This Delta deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/234:05 pm
SEA
-
SOU
1 stop17h 55m
Delta
Tue 3/315:20 pm
SOU
-
SEA
1 stop26h 25m
Delta
Deal found 1/25$804
This KLM deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/265:30 pm
SEA
-
SOU
1 stop31h 05m
KLM
Sun 5/105:20 pm
SOU
-
SEA
1 stop31h 10m
KLM
Deal found 1/26$817
This Delta deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/234:05 pm
SEA
-
SOU
1 stop17h 55m
Delta
Wed 4/15:20 pm
SOU
-
SEA
1 stop26h 25m
Delta
Deal found 1/25$820
This Delta deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/211:45 pm
SEA
-
SOU
2 stops59h 35m
Delta
Tue 3/319:05 am
SOU
-
SEA
1 stop34h 40m
Delta
Deal found 1/25$822
This Delta deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/265:30 pm
SEA
-
SOU
1 stop15h 20m
Delta
Sun 5/109:15 am
SOU
-
SEA
2 stops21h 02m
Delta
Deal found 1/24$827
This Delta deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/237:15 am
SEA
-
SOU
2 stops18h 05m
Delta
Fri 4/39:05 am
SOU
-
SEA
2 stops22h 35m
Delta
Deal found 1/25$835

Find flight deals from Seattle to Southampton

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Southampton (SOU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$753
(KLM)

One-way from

$571
(Delta)

Popular in

June

Cheapest in

October

Average price

$650
Provider with most accurate pricing for Seattle/Tacoma Intl-Southampton Eastleigh flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Southampton Eastleigh flights.
Search Deals
From Seattle/Tacoma Intl to Southampton Eastleigh
Search Deals
One-way flight from Seattle/Tacoma Intl to Southampton Eastleigh
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($137 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated January 26, 2026.
Use the filters below to find and compare flights from Seattle to Southampton that are best for you.

Fly from

Seattle

Fly to

Southampton

Route

Depart

Return

Price

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 3/12

9:40 am-5:00 pm

2 stops24h 20m

Southampton Eastleigh

Thu 3/19

8:50 am-10:15 pm

2 stops20h 25m

$767

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 3/23

4:05 pm-5:00 pm

1 stop17h 55m

Southampton Eastleigh

Tue 3/31

5:20 pm-11:45 am

1 stop26h 25m

$804

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 4/26

1:45 pm-4:50 pm

1 stop19h 05m

Southampton Eastleigh

Sun 5/10

9:15 am-11:42 am

1 stop34h 27m

$817

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 3/23

4:05 pm-5:00 pm

1 stop17h 55m

Southampton Eastleigh

Wed 4/1

5:20 pm-11:45 am

1 stop26h 25m

$820

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Mon 3/23

7:15 am-8:20 am

2 stops18h 05m

Southampton Eastleigh

Fri 4/3

9:05 am-4:30 pm

1 stop15h 25m

$825

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 3/22

9:45 pm-5:00 pm

2 stops36h 15m

Southampton Eastleigh

Tue 3/31

5:20 pm-3:50 pm

2 stops30h 30m

$825

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 4/26

5:30 pm-4:50 pm

1 stop15h 20m

Southampton Eastleigh

Sun 5/10

9:15 am-10:17 pm

2 stops21h 02m

$827

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 1/31

10:59 pm-8:50 am

2 stops25h 51m

$571

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Compare providers for flights from Seattle to Southampton

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Southampton in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Southampton flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Southampton flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Southampton flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Southampton flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Southampton flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Southampton

Have a flexible travel schedule? Discover the best time to fly to Southampton from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Southampton

What is the cheapest month to book a flight from Seattle to Southampton?

Currently, May is the cheapest month in which you can book a flight from Seattle to Southampton (average of $493). Flying from Seattle to Southampton in June is currently the most expensive (average of $789). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Southampton. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Southampton?

    Departing from Seattle to Southampton will take you 18h 05m. Airlines will cover a distance of 4787 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Seattle to Southampton that include hotel bookings?

    Yes. In addition to deals on Seattle to Southampton flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Southampton?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Southampton.

  • Can I find deals for business class flights from Seattle to Southampton?

    Yes. Cheapflights offers flight deals from Seattle to Southampton by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Southampton?

    Currently, May is the cheapest month in which you can book a flight from Seattle to Southampton (average of $493). Flying from Seattle to Southampton in June is currently the most expensive (average of $789). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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