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Cheap flights from Southampton to Washington from £491

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 22/9. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — SEA
3 May — 10 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Southampton to Washington

Enter your travel dates to find the best prices.

Cheapest flights from Southampton to Washington
Explore the most affordable flight options available from Southampton to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 April 2026.

Thu 14/509:20
SOU
-
SEA
1 stop15h 50m
Aer Lingus
Thu 21/519:10
SEA
-
SOU
1 stop16h 20m
Aer Lingus
Deal found 30/3£622
Sat 16/517:20
SOU
-
SEA
2 stops31h 50m
Multiple Airlines
Sat 23/519:10
SEA
-
SOU
1 stop13h 40m
Multiple Airlines
Deal found 1/4£655
Thu 14/509:05
SOU
-
SEA
2 stops19h 38m
Virgin Atlantic
Thu 21/517:40
SEA
-
SOU
1 stop15h 10m
Virgin Atlantic
Deal found 30/3£726
Wed 15/409:05
SOU
-
SEA
1 stop15h 25m
Delta
Sun 19/409:50
SEA
-
SOU
2 stops23h 00m
Delta
Deal found 30/3£745
Wed 15/409:05
SOU
-
SEA
1 stop15h 25m
KLM
Sun 19/413:45
SEA
-
SOU
1 stop34h 50m
KLM
Deal found 30/3£748
Wed 23/909:20
SOU
-
SEA
1 stop15h 50m
British Airways
Sun 27/919:10
SEA
-
SOU
1 stop13h 40m
British Airways
Deal found 2/4£779

Find flight deals from Southampton to Washington

Keep the following information in mind while searching for Southampton to Washington flight deals. Data was last updated 3 April 2026.

Round-trip from

£622

One-way from

£491

Popular in

July

Cheapest in

February

Average price

£537
Aer Lingus
  • Aer Lingus
  • 14/5-21/5
  • 2 total stops
  • 32h 10m total
  • Southampton to Washington
Search Deals
British Airways
  • British Airways
  • 22/9
  • 1 total stop
  • 15h 55m total
  • Southampton to Washington
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£56 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Southampton to Washington 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 858,174 searches. Data last updated 3 April 2026.
Use the filters below to find and compare flights from Southampton to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 14/5

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Thu 21/5

19:10-19:30

1 stop16h 20m

£622

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 15/4

09:05-16:30

1 stop15h 25m

Seattle/Tacoma Intl

Sun 19/4

09:50-16:50

2 stops23h 00m

£745
Fastest return journey

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 23/9

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Sun 27/9

19:10-16:50

1 stop13h 40m

£782

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 15/5

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Sat 6/6

19:10-19:30

1 stop16h 20m

£806

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 15/5

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Sun 7/6

13:30-19:25

2 stops21h 55m

£815
Cheapest one-way

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 19/9

10:15-11:35

2 stops57h 20m

£519

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 18/9

17:20-17:10

1 stop31h 50m

£543
Fastest single journey

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 29/4

09:20-17:10

1 stop15h 50m

£740

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 2/5

09:20-17:10

1 stop15h 50m

£742

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 1/5

09:20-17:10

1 stop15h 50m

£742

Flights are sorted by cheapest return flights first.

Deals found on 29/3

Showing 1-10 of 13 resultsSorted by cheapest first
1
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Best time to book a flight from Southampton to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Southampton with our price prediction graph.
Estimated return 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 Southampton to Washington

What is the cheapest month to book a flight from Southampton to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Southampton to State of Washington (average of £354). Flying from Southampton to State of Washington in August is currently the most expensive (average of £473). 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 Southampton to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Southampton to Washington?

    Southampton Eastleigh (SOU) is the airport you will fly out of if you book a flight from Southampton to Washington. It is only a 3.5 mi journey to Eastleigh (SOU) from Southampton’s city center.

  • How long is the flight from Southampton to State of Washington?

    Departing from Southampton to State of Washington will take you 15h 25m. The distance from Southampton to State of Washington is about 4787 mi. This flight may include one or multiple stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Southampton to Washington 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 Southampton to State of Washington?

    Currently, January is the cheapest month in which you can book a flight from Southampton to State of Washington (average of £354). Flying from Southampton to State of Washington in August is currently the most expensive (average of £473). 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

Browse thousands of different options on Cheapflights for your next trip

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Southampton to Washington?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Washington from Southampton today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Southampton to Washington?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Washington from Southampton.

Can Cheapflights find flights from Southampton to Washington with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Southampton to Washington, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Southampton to Washington become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Washington from Southampton today and book when prices fit your budget.

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