Find flights
When to book
FAQs

Cheap flights from Washington, D.C. Dulles Intl Airport to Southampton from £279

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 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SOU
17 Sep — 24 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Dulles Intl to Southampton

Enter your travel dates to find the best prices.

Cheapest flights from Dulles Intl to Southampton
Explore the most affordable flight options available from Dulles Intl to Southampton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 August 2026.

Sun 4/1017:15 -
1 stop18h 35m
Tue 20/1009:15 -
1 stop15h 20m
Deal found 15/8£646
Fri 2/1020:30 -
2 stops18h 00m
Thu 15/1009:20 -
2 stops15h 00m
Deal found 15/8£648
Sun 4/1015:50 -
2 stops20h 00m
Tue 20/1009:15 -
1 stop11h 30m
Deal found 15/8£672
Sun 27/923:20 -
2 stops32h 30m
Sun 4/1009:20 -
1 stop11h 25m
Deal found 13/8£688
Wed 30/917:15 -
1 stop10h 25m
Wed 7/1020:00 -
2 stops27h 50m
Deal found 16/8£699
Fri 2/1020:55 -
1 stop14h 55m
Thu 15/1009:20 -
1 stop14h 50m
Deal found 15/8£704
Tue 29/920:30 -
2 stops18h 00m
Tue 6/1009:15 -
1 stop11h 30m
Deal found 14/8£720
Sun 27/917:15 -
1 stop10h 25m
Sun 4/1009:20 -
1 stop11h 25m
Deal found 13/8£732
Thu 1/1017:15 -
1 stop10h 25m
Thu 8/1009:20 -
1 stop14h 50m
Deal found 17/8£753
Fri 2/1020:30 -
2 stops18h 00m
Mon 12/1019:20 -
2 stops24h 50m
Deal found 15/8£758

Find flight deals from Dulles Intl to Southampton

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) 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 18 August 2026.

Round-trip from

£646

One-way from

£279

Popular in

June

Cheapest in

January

Average price

£657
Aer Lingus
  • Aer Lingus
  • 4/10-20/10
  • 2 total stops
  • 33h 55m total
  • Washington, D.C. to Southampton
Search Deals
30/9
  • 30/9
  • 3 total stops
  • 27h 18m total
  • Washington, D.C. to Southampton
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£115 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Dulles Intl 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 858,174 searches. Data last updated 18 August 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Southampton that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Thu 1/10

17:15-08:40

1 stop10h 25m

Southampton Eastleigh

Thu 8/10

09:20-19:10

1 stop14h 50m

£753

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sun 27/9

15:45-19:30

3 stops22h 45m

Southampton Eastleigh

Sun 4/10

09:20-15:45

1 stop11h 25m

£800

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sun 6/9

11:10-08:35

2 stops16h 25m

Southampton Eastleigh

Tue 15/9

09:05-15:35

1 stop11h 30m

£907

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sun 6/9

11:10-08:35

2 stops16h 25m

Southampton Eastleigh

Tue 15/9

09:05-23:23

2 stops19h 18m

£915

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sat 29/8

17:15-16:50

1 stop18h 35m

Southampton Eastleigh

Mon 7/9

20:00-19:35

1 stop28h 35m

£975

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Fri 28/8

17:30-08:45

1 stop10h 15m

Southampton Eastleigh

Sat 5/9

09:15-19:18

2 stops15h 03m

£998

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Thu 1/10

17:15-08:40

1 stop10h 25m

Southampton Eastleigh

Mon 5/10

20:00-15:45

1 stop24h 45m

£1,026
Cheapest one-way

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Wed 30/9

17:15-16:50

1 stop18h 35m

£362

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sat 5/9

17:15-08:35

1 stop10h 20m

£398
Fastest single journey

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sat 5/9

17:15-08:35

1 stop10h 20m

£415

Flights are sorted by cheapest return flights first.

Deals found on 16/8

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

Best time to book a flight from Dulles Intl to Southampton

Have a flexible travel schedule? Discover the best time to fly to Southampton from Dulles Intl 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.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Southampton. 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 into for flights to Southampton from Washington, D.C. Dulles Intl?

    Most people fly into Southampton Eastleigh (SOU) if they book a flight to Southampton from Washington, D.C. Dulles Intl. On average, Eastleigh has 0 inbound flights from Washington, D.C. Dulles Intl per day from 0 airlines. Southampton Eastleigh is conveniently located just 3.5 mi from Southampton’s city center.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Southampton?

    Departing from Washington, D.C. Dulles Intl Airport to Southampton will take you 10h 25m. Airlines will cover a distance of 3639 mi. Both multi-stop and direct flights can be found to your destination and back.

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

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

  • How can I find direct flights from Dulles Intl to Southampton?

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 Dulles Intl to Southampton?

Cheapflights makes it easy to find Dulles Intl to Southampton flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

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 Southampton from Dulles Intl.

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

Certainly. Search results for flights to Southampton from Dulles Intl shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

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

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.