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Cheap flights from Southampton to Washington, D.C. Dulles Intl Airport from £586

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 21/5. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — IAD
1 May — 8 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 1 April 2026.

Wed 15/409:20
SOU
-
IAD
2 stops15h 00m
Multiple Airlines
Sun 19/420:30
IAD
-
SOU
2 stops18h 00m
Multiple Airlines
Deal found 30/3£653
Mon 20/709:20
SOU
-
IAD
1 stop11h 25m
British Airways
Tue 25/817:15
IAD
-
SOU
1 stop9h 50m
British Airways
Deal found 1/4£694
Sun 19/720:00
SOU
-
IAD
1 stop24h 45m
British Airways
Tue 25/817:15
IAD
-
SOU
1 stop9h 50m
British Airways
Deal found 1/4£704
Wed 29/409:20
SOU
-
IAD
1 stop11h 25m
British Airways
Wed 6/520:55
IAD
-
SOU
1 stop14h 55m
British Airways
Deal found 1/4£705
Mon 20/709:20
SOU
-
IAD
1 stop11h 25m
British Airways
Thu 27/817:15
IAD
-
SOU
1 stop10h 25m
British Airways
Deal found 1/4£711
Sun 19/717:20
SOU
-
IAD
1 stop27h 25m
British Airways
Mon 24/822:25
IAD
-
SOU
2 stops16h 00m
British Airways
Deal found 1/4£713
Thu 30/417:20
SOU
-
IAD
1 stop31h 05m
British Airways
Mon 4/517:15
IAD
-
SOU
1 stop10h 25m
British Airways
Deal found 30/3£715
Sun 19/717:20
SOU
-
IAD
1 stop27h 25m
British Airways
Thu 27/817:15
IAD
-
SOU
1 stop10h 25m
British Airways
Deal found 1/4£720
Fri 24/709:20
SOU
-
IAD
1 stop11h 25m
British Airways
Tue 25/817:15
IAD
-
SOU
1 stop9h 50m
British Airways
Deal found 1/4£725
Sat 6/609:20
SOU
-
IAD
1 stop11h 25m
British Airways
Sat 13/617:15
IAD
-
SOU
1 stop10h 20m
British Airways
Deal found 1/4£728

Find 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 1 April 2026.

Round-trip from

£653

One-way from

£586

Popular in

July

Cheapest in

February

Average price

£524
15/4-19/4
  • 15/4-19/4
  • 4 total stops
  • 33h 00m total
  • Southampton to Washington, D.C.
Search Deals
Aer Lingus
  • Aer Lingus
  • 21/5
  • 1 total stop
  • 11h 25m total
  • Southampton to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£55 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 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 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 1 April 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 15/4

09:20-19:20

2 stops15h 00m

Washington, D.C. Dulles Intl

Sun 19/4

20:30-19:30

2 stops18h 00m

£653
Fastest return journey

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 21/7

09:15-15:45

1 stop11h 30m

Washington, D.C. Dulles Intl

Tue 25/8

17:15-08:05

1 stop9h 50m

£694

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 30/4

17:20-19:25

1 stop31h 05m

Washington, D.C. Dulles Intl

Mon 4/5

17:15-08:40

1 stop10h 25m

£715

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 1/5

20:00-15:45

1 stop24h 45m

Washington, D.C. Dulles Intl

Tue 5/5

21:05-19:30

1 stop17h 25m

£740

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 24/7

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Thu 27/8

17:15-08:40

1 stop10h 25m

£741

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 23/4

20:00-15:45

1 stop24h 45m

Washington, D.C. Dulles Intl

Mon 27/4

20:55-19:30

1 stop17h 35m

£755
Cheapest one-way
Fastest single journey

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 21/5

09:20-15:45

1 stop11h 25m

£586

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 21/5

06:50-15:45

2 stops37h 55m

£709

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 29/5

06:50-17:25

2 stops15h 35m

£709

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sat 25/4

09:20-15:45

1 stop11h 25m

£935

Flights are sorted by cheapest return flights first.

Deals found on 29/3

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

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, January is the cheapest month in which you can book a flight from Southampton to Washington, D.C. Dulles Intl Airport (average of £338). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £463). 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.

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated 1 April 2026.
See what other customers who have flown with Aer Lingus from Southampton to Washington, D.C. Dulles Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,494 reviews
Check prices

Crew

8.1

Overall

7.2

Comfort

7.2

Entertainment

7.0

Food

6.6

Boarding

7.4

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.
Aer Lingus
7.2
Good
1,494 reviews
Aer Lingus
7.2
Good
1,494 reviews
Check prices

Crew

8.1

Overall

7.2

Comfort

7.2

Entertainment

7.0

Food

6.6

Boarding

7.4

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.

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 1 airline. 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 30m. Southampton and Washington, D.C. Dulles Intl Airport are separated by a distance of 3639 mi.

  • What is the cheapest airline to fly from Southampton to Washington, D.C. Dulles Intl Airport round-trip?

    Cheapflights users have booked flights from Southampton to Washington, D.C. Dulles Intl Airport round-trip from £456.

  • 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, January is the cheapest month in which you can book a flight from Southampton to Washington, D.C. Dulles Intl Airport (average of £338). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £463). 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
Gaithersburg
Woodbridge
Arlington
Alexandria
Sterling

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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
Heathrow to Baltimore flights
Heathrow to Reagan-National flights
Gatwick to Dulles Intl flights
Stansted to Dulles Intl flights
London City to Dulles Intl flights
Gatwick to Reagan-National flights
Gatwick to Baltimore flights
Luton to Dulles Intl flights
Edinburgh to Dulles Intl flights
Manchester to Dulles Intl flights
Manchester to Baltimore flights
Stansted to Baltimore flights
Manchester to Reagan-National flights
Edinburgh to Reagan-National flights
Edinburgh to Baltimore flights
Luton to Baltimore flights
London City to Baltimore flights
Birmingham to Dulles Intl flights
London City to Reagan-National flights
Birmingham to Reagan-National flights
Newcastle upon Tyne to Dulles Intl flights
Birmingham to Baltimore flights
Bristol to Dulles Intl flights
Leeds to Dulles Intl flights
Bristol to Baltimore flights
Bristol to Reagan-National flights
Newcastle upon Tyne to Reagan-National flights
Newcastle upon Tyne to Baltimore flights
Southampton to Baltimore flights
Southend to Dulles Intl flights
Southampton to Reagan-National flights
Leeds to Baltimore flights
Liverpool to Baltimore flights
Exeter to Dulles Intl flights
Grimsby to Baltimore flights
Grimsby to Reagan-National flights
Grimsby to Dulles Intl flights
Newquay to Baltimore flights
Leeds to Reagan-National flights
East Midlands to Baltimore flights
Doncaster to Baltimore flights
Norwich to Dulles Intl flights
Norwich to Reagan-National flights
Norwich to Baltimore flights
Doncaster to Dulles Intl flights

Top airline flying from Southampton to Dulles Intl

Discover the top airline that operate flights from Southampton to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 1 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£456Average£598FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus 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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