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$401+ 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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SOU
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap 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 September 11, 2025.

Round-trip from

$883
(KLM)

One-way from

$401
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$696
From Seattle/Tacoma Intl to Southampton Eastleigh
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One-way flight from Seattle/Tacoma Intl to Southampton Eastleigh
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Highest demand for flights based on searches. 15% potential increase in price ($139 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This KLM deal was found by Cheapflights users on 9/10. 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.
Wed 9/242:10 pmSEA - SOU
1 stop18h 50mKLM
Sat 10/116:05 pmSOU - SEA
1 stop30h 00mKLM
Deal found 9/10$883
This Delta deal was found by Cheapflights users on 9/11. 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 10/1111:55 pmSEA - SOU
2 stops24h 50mDelta
Sun 10/196:25 pmSOU - SEA
1 stop29h 40mDelta
Deal found 9/11$927
This Delta deal was found by Cheapflights users on 9/11. 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.
Fri 10/105:40 pmSEA - SOU
1 stop15h 50mDelta
Sun 10/196:25 pmSOU - SEA
1 stop29h 40mDelta
Deal found 9/11$1,013
This Delta deal was found by Cheapflights users on 9/10. 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.
Wed 9/2410:15 amSEA - SOU
2 stops22h 45mDelta
Sat 10/119:20 amSOU - SEA
2 stops21h 02mDelta
Deal found 9/10$1,024
This British Airways deal was found by Cheapflights users on 9/10. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/238:05 pmSEA - SOU
1 stop15h 35mBritish Airways
Thu 11/277:55 pmSOU - SEA
2 stops23h 35mBritish Airways
Deal found 9/10$2,317
This British Airways deal was found by Cheapflights users on 9/10. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:50 pmSEA - SOU
2 stops16h 35mBritish Airways
Mon 12/296:15 pmSOU - SEA
3 stops25h 15mBritish Airways
Deal found 9/10$4,055

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 September 11, 2025.
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

Wed 9/24

2:10 pm-5:00 pm

1 stop18h 50m

Southampton Eastleigh

Sat 10/11

6:05 pm-4:05 pm

1 stop30h 00m

$883

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 10/11

11:55 pm-8:45 am

2 stops24h 50m

Southampton Eastleigh

Sun 10/19

6:25 pm-4:05 pm

1 stop29h 40m

$927

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 10/10

5:40 pm-5:30 pm

1 stop15h 50m

Southampton Eastleigh

Sun 10/19

6:25 pm-4:05 pm

1 stop29h 40m

$1,013

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 11/1

6:15 pm-11:55 am

3 stops58h 40m

$401

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sun 9/21

5:40 pm-8:45 am

1 stop31h 05m

$534

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Sat 9/20

11:40 pm-8:45 am

2 stops25h 05m

$539

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 9/19

10:05 pm-8:45 am

2 stops26h 40m

$589

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 10/31

12:34 am-8:45 am

2 stops25h 11m

$626

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 9/17

5:40 pm-5:00 pm

1 stop15h 20m

$643

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 9/18

7:10 am-8:45 am

2 stops17h 35m

$708

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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, November is the cheapest month in which you can book a flight from Seattle to Southampton (average of $787). Flying from Seattle to Southampton in June is currently the most expensive (average of $1,308). 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.

What is the cheapest time of day to fly from SEA to SOU?

Find hourly flight availability from Seattle to Southampton. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

When flying from Seattle to Southampton, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 10% versus a flight in the evening.

Reviews of airlines servicing Southampton

Get insights into the airlines that provide service to Southampton. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Southampton. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with KLM from Seattle to Southampton by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
KLM
7.8
Good
1,385 reviews
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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 50m. 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.

  • What is the cheapest airline to fly from Seattle to Southampton round-trip?

    KLM, at $840, was found to be the cheapest airline from Seattle to Southampton..

  • 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, November is the cheapest month in which you can book a flight from Seattle to Southampton (average of $787). Flying from Seattle to Southampton in June is currently the most expensive (average of $1,308). 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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Alternative routes for Seattle to Southampton

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Top airline flying from Seattle to Southampton

Discover the top airline that operate flights from Seattle to Southampton. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$840Average$1,281FlexibilityNo cancel feeOn-time75%

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