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Cheap flights from Southampton to Washington, D.C. Dulles Intl Airport from £544

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/12. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — IAD
2 Dec — 9 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Southampton to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Southampton (SOU) to Dulles Intl (IAD). 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 November 2025.

Round-trip from

£544

Popular in

July

Cheapest in

February

Average price

£511
KLM
  • KLM
  • 17/12-24/12
  • 3 total stops
  • 42h 05m total
  • Southampton to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£54 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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Find flight deals from Southampton to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest flights from Southampton to Dulles Intl
Explore the most affordable flight options available from Southampton to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 November 2025.

Wed 17/1208:40SOU - IAD
1 stop12h 25mKLM
Wed 24/1221:25IAD - SOU
2 stops29h 40mKLM
Deal found 2/11£544
Mon 15/1209:30SOU - IAD
1 stop15h 00mAer Lingus
Mon 22/1217:05IAD - SOU
1 stop13h 50mAer Lingus
Deal found 31/10£594
Mon 15/1208:40SOU - IAD
1 stop12h 25mVirgin Atlantic
Mon 22/1212:32IAD - SOU
2 stops14h 38mVirgin Atlantic
Deal found 31/10£685
Sun 16/1109:30SOU - IAD
1 stop15h 00mAer Lingus
Thu 20/1121:00IAD - SOU
1 stop30h 45mAer Lingus
Deal found 31/10£916
Wed 17/1208:40SOU - IAD
2 stops15h 50mMultiple Airlines
Wed 24/1222:30IAD - SOU
3 stops28h 35mMultiple Airlines
Deal found 2/11£1,000
Mon 15/1208:40SOU - IAD
3 stops35h 55mMultiple Airlines
Mon 22/1217:05IAD - SOU
3 stops34h 05mMultiple Airlines
Deal found 31/10£1,011

Cheapflights Fare Finder

 
Customise your flight search to find flights from Southampton to Dulles Intl 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 November 2025.
Use the filters below to find and compare flights from Southampton to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Southampton

Fly to

Dulles Intl

Route

Depart

Return

Price

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 17/12

08:40-16:05

1 stop12h 25m

Washington, D.C. Dulles Intl

Wed 24/12

21:25-08:05

2 stops29h 40m

£544

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 1/4

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Sun 5/4

17:50-08:50

1 stop10h 00m

£547

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 15/12

09:30-19:30

1 stop15h 00m

Washington, D.C. Dulles Intl

Mon 22/12

17:05-11:55

1 stop13h 50m

£594

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 15/12

08:40-16:05

1 stop12h 25m

Washington, D.C. Dulles Intl

Mon 22/12

12:32-08:10

2 stops14h 38m

£685

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 16/11

09:30-19:30

1 stop15h 00m

Washington, D.C. Dulles Intl

Thu 20/11

21:00-08:45

1 stop30h 45m

£916

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 17/12

12:25-19:30

1 stop12h 05m

£712

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 22/12

20:50-15:35

2 stops23h 45m

£945

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 30/11

09:30-19:30

1 stop15h 00m

£1,078

Flights are sorted by cheapest return flights first.

Deals found on 2/11

Best time to book a flight from Southampton to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl 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, D.C. Dulles Intl Airport

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

Currently, February is the cheapest month in which you can book a flight from Southampton to Washington, D.C. Dulles Intl Airport (average of £344). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £547). 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 Dulles Intl. 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, D.C. Dulles Intl?

    Most people fly from Southampton Eastleigh (SOU) if they book a flight from Southampton to Washington, D.C. Dulles Intl. On average, Eastleigh has 0 outbound flights to 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 Southampton to Washington, D.C. Dulles Intl Airport?

    Departing from Southampton to Washington, D.C. Dulles Intl Airport will take you 11h 15m. Southampton and Washington, D.C. Dulles Intl Airport are separated by a distance of 3639 mi. This flight may include one or multiple stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Southampton to Dulles Intl 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 Washington, D.C. Dulles Intl Airport?

    Currently, February is the cheapest month in which you can book a flight from Southampton to Washington, D.C. Dulles Intl Airport (average of £344). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £547). 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

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Woodbridge
Arlington
Alexandria
College Park
Tysons

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Alternative routes for Southampton to Dulles Intl

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

Cheapflights makes it easy to find Southampton to Dulles Intl 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 Southampton to Dulles Intl?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Southampton to Dulles Intl.

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

Need flexible booking options for your flight to Dulles Intl from Southampton? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights offers price alerts on Southampton to Dulles Intl flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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