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Cheap flights from Washington, D.C. Dulles Intl Airport to Southampton from £315

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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SOU
1 Sep — 8 Sep1
1 adult

Cheap 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 27 August 2025.

Round-trip from

£509

One-way from

£315

Popular in

June

Cheapest in

January

Average price

£510
Aer Lingus
  • Aer Lingus
  • 7/10-14/10
  • 2 total stops
  • 25h 05m total
  • Washington, D.C. to Southampton
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11/9
  • 11/9
  • 3 total stops
  • 52h 35m total
  • Washington, D.C. to Southampton
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£54 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
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Find flight deals from Dulles Intl to Southampton

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 27 August 2025.

Sat 8/1117:05IAD - SOU
1 stop10h 40mAer Lingus
Sat 15/1109:30SOU - IAD
1 stop15h 00mAer Lingus
Deal found 24/8£558
Sat 11/1022:05IAD - SOU
2 stops16h 25mMultiple Airlines
Sat 18/1016:25SOU - IAD
3 stops32h 34mMultiple Airlines
Deal found 26/8£563
Thu 9/1017:20IAD - SOU
1 stop21h 10mAer Lingus
Thu 16/1009:40SOU - IAD
1 stop14h 15mAer Lingus
Deal found 25/8£593
Wed 10/917:25IAD - SOU
1 stop10h 20mKLM
Wed 24/909:20SOU - IAD
1 stop11h 15mKLM
Deal found 25/8£603
Sat 8/1113:00IAD - SOU
2 stops14h 50mKLM
Sat 15/1109:25SOU - IAD
1 stop11h 40mKLM
Deal found 24/8£607
Thu 9/1017:25IAD - SOU
1 stop18h 35mVirgin Atlantic
Thu 16/1009:20SOU - IAD
2 stops19h 52mVirgin Atlantic
Deal found 25/8£611
Wed 10/917:25IAD - SOU
1 stop10h 20mKLM
Tue 16/909:20SOU - IAD
2 stops15h 17mKLM
Deal found 26/8£612
Sat 8/1118:00IAD - SOU
2 stops20h 40mMultiple Airlines
Sat 15/1109:30SOU - IAD
2 stops36h 10mMultiple Airlines
Deal found 24/8£614

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 27 August 2025.
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

Tue 7/10

17:20-08:05

1 stop9h 45m

Southampton Eastleigh

Tue 14/10

09:10-19:30

1 stop15h 20m

£509

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sat 8/11

17:05-08:45

1 stop10h 40m

Southampton Eastleigh

Sat 15/11

09:30-19:30

1 stop15h 00m

£558

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 9/10

17:20-19:30

1 stop21h 10m

Southampton Eastleigh

Thu 16/10

09:40-18:55

1 stop14h 15m

£593

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sat 20/9

17:25-08:45

1 stop10h 20m

Southampton Eastleigh

Sat 27/9

18:05-15:35

1 stop26h 30m

£603

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/9

17:25-08:45

1 stop10h 20m

Southampton Eastleigh

Wed 24/9

09:20-15:35

1 stop11h 15m

£603

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Tue 30/9

17:25-17:00

1 stop18h 35m

Southampton Eastleigh

Wed 15/10

09:20-15:35

1 stop11h 15m

£603

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sat 8/11

18:05-08:50

1 stop9h 45m

Southampton Eastleigh

Sat 15/11

17:30-16:05

1 stop27h 35m

£603

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Fri 7/11

18:05-08:50

1 stop9h 45m

Southampton Eastleigh

Fri 14/11

17:30-16:05

1 stop27h 35m

£603

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/9

17:25-08:45

1 stop10h 20m

Southampton Eastleigh

Tue 16/9

09:20-15:35

1 stop11h 15m

£604

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 11/9

22:20-07:55

3 stops52h 35m

£315

Flights are sorted by cheapest return flights first.

Deals found on 25/8

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, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Southampton (average of £203). Flying from Washington, D.C. Dulles Intl Airport to Southampton in November is currently the most expensive (average of £262). 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 9h 45m. 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, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Southampton (average of £203). Flying from Washington, D.C. Dulles Intl Airport to Southampton in November is currently the most expensive (average of £262). 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
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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 Luton flights
Baltimore to Stansted flights
Dulles Intl to Edinburgh flights
Baltimore to London City flights
Baltimore to Luton flights
Baltimore to Edinburgh flights
Reagan-National to Edinburgh flights
Dulles Intl to Manchester flights
Reagan-National to Manchester flights
Baltimore to Manchester flights
Reagan-National to Stansted flights
Dulles Intl to Birmingham flights
Reagan-National to Luton flights
Dulles Intl to Leeds flights
Baltimore to Birmingham flights
Dulles Intl to Liverpool flights
Baltimore to Leeds flights
Dulles Intl to Bristol flights
Reagan-National to Bristol flights
Baltimore to Bristol flights
Dulles Intl to Newcastle upon Tyne flights
Baltimore to Southampton flights
Baltimore to Newcastle upon Tyne flights
Dulles Intl to Exeter flights
Baltimore to East Midlands flights
Dulles Intl to East Midlands 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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