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Cheap flights from Washington, D.C. Dulles Intl Airport to Southampton from £352

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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SOU
4 Mar — 11 Mar1
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 2 February 2026.

Wed 18/320:40
IAD
-
SOU
2 stops16h 40m
Multiple Airlines
Wed 25/309:25
SOU
-
IAD
2 stops14h 05m
Multiple Airlines
Deal found 1/2£535
Sun 1/318:05
IAD
-
SOU
1 stop18h 00m
Delta
Thu 12/308:50
SOU
-
IAD
1 stop12h 15m
Delta
Deal found 2/2£569
Sun 1/312:24
IAD
-
SOU
2 stops23h 41m
Delta
Wed 11/317:35
SOU
-
IAD
1 stop27h 30m
Delta
Deal found 2/2£572
Mon 24/818:10
IAD
-
SOU
1 stop9h 35m
Delta
Mon 7/909:05
SOU
-
IAD
1 stop11h 30m
Delta
Deal found 2/2£580
Thu 19/319:05
IAD
-
SOU
1 stop17h 55m
Delta
Wed 8/409:05
SOU
-
IAD
1 stop11h 30m
Delta
Deal found 2/2£581
Fri 6/318:05
IAD
-
SOU
1 stop9h 45m
Delta
Thu 12/308:50
SOU
-
IAD
1 stop12h 15m
Delta
Deal found 2/2£656
Sat 29/817:40
IAD
-
SOU
1 stop10h 05m
KLM
Mon 7/917:20
SOU
-
IAD
1 stop27h 15m
KLM
Deal found 1/2£661
Mon 24/810:40
IAD
-
SOU
2 stops17h 05m
Multiple Airlines
Tue 8/917:20
SOU
-
IAD
2 stops28h 21m
Multiple Airlines
Deal found 1/2£663
Thu 19/313:19
IAD
-
SOU
2 stops15h 01m
Delta
Thu 26/308:50
SOU
-
IAD
2 stops18h 09m
Delta
Deal found 2/2£684

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 2 February 2026.

Round-trip from

£535

One-way from

£352

Popular in

June

Cheapest in

September

Average price

£470
18/3-25/3
  • 18/3-25/3
  • 4 total stops
  • 30h 45m total
  • Washington, D.C. to Southampton
Search Deals
Aer Lingus
  • Aer Lingus
  • 4/5
  • 1 total stop
  • 30h 25m total
  • Washington, D.C. to Southampton
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£50 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 2 February 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

Dulles Intl

Fly to

Southampton

Route

Depart

Return

Price

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 18/3

20:40-17:20

2 stops16h 40m

Southampton Eastleigh

Wed 25/3

09:25-19:30

2 stops14h 05m

£535

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Tue 3/3

18:05-17:00

1 stop17h 55m

Southampton Eastleigh

Mon 9/3

17:40-17:05

1 stop27h 25m

£569

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 18/3

19:05-17:25

1 stop18h 20m

Southampton Eastleigh

Wed 25/3

08:50-17:05

1 stop12h 15m

£569

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Tue 3/3

18:05-17:00

1 stop17h 55m

Southampton Eastleigh

Thu 12/3

08:50-17:05

1 stop12h 15m

£569

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Mon 2/3

18:05-17:00

1 stop17h 55m

Southampton Eastleigh

Sun 8/3

09:30-17:05

1 stop11h 35m

£569

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 4/3

06:00-08:20

2 stops21h 20m

Southampton Eastleigh

Mon 9/3

17:40-17:05

1 stop27h 25m

£572

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sun 1/3

12:24-17:05

2 stops23h 41m

Southampton Eastleigh

Wed 11/3

17:35-17:05

1 stop27h 30m

£572

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Mon 2/3

15:42-17:00

2 stops20h 18m

Southampton Eastleigh

Tue 10/3

17:35-17:05

1 stop27h 30m

£572

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 19/3

13:19-08:20

2 stops15h 01m

Southampton Eastleigh

Thu 26/3

08:50-17:05

1 stop12h 15m

£572

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 19/3

13:19-08:20

2 stops15h 01m

Southampton Eastleigh

Wed 8/4

09:05-22:59

2 stops18h 54m

£591

Flights are sorted by cheapest return flights first.

Deals found on 2/2

Showing 1-10 of 15 results
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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.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Southampton

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Southampton?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Southampton (average of £245). Flying from Washington, D.C. Dulles Intl Airport to Southampton in June is currently the most expensive (average of £538). 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 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 15h 01m. 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.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Southampton?

    Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Southampton (average of £245). Flying from Washington, D.C. Dulles Intl Airport to Southampton in June is currently the most expensive (average of £538). 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 Dulles Intl to Southampton

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Heathrow flights
Baltimore to Heathrow flights
Dulles Intl to Gatwick flights
Reagan-National to Heathrow flights
Dulles Intl to London City flights
Baltimore to Gatwick flights
Reagan-National to Gatwick flights
Dulles Intl to Edinburgh flights
Dulles Intl to Luton flights
Baltimore to Luton flights
Baltimore to Edinburgh flights
Reagan-National to Edinburgh flights
Reagan-National to Luton flights
Baltimore to Stansted flights
Dulles Intl to Manchester flights
Baltimore to Manchester flights
Reagan-National to Manchester flights
Baltimore to London City flights
Reagan-National to Stansted flights
Dulles Intl to Birmingham flights
Dulles Intl to Leeds flights
Baltimore to Birmingham flights
Dulles Intl to Liverpool flights
Baltimore to Southampton flights
Dulles Intl to Bristol flights
Dulles Intl to Newcastle upon Tyne flights
Baltimore to Newcastle upon Tyne flights
Baltimore to Leeds flights
Baltimore to Bristol flights
Dulles Intl to East Midlands flights
Dulles Intl to Exeter flights
Baltimore to East Midlands flights
Reagan-National to Bristol flights

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.

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