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Cheap flights from Southampton to Washington, D.C. Dulles Intl Airport from £420

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 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — IAD
22 Jul — 29 Jul1
1 adult

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 17 July 2025.

Round-trip from

£545

One-way from

£420

Popular in

August

Cheapest in

February

Average price

£663
Virgin Atlantic
  • Virgin Atlantic
  • 15/9-22/9
  • 3 total stops
  • 31h 40m total
  • Southampton to Washington, D.C.
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20/10
  • 20/10
  • 3 total stops
  • 35h 56m total
  • Southampton to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£43 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
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Find flight deals from Southampton to Dulles Intl

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 17 July 2025.

Mon 15/909:20SOU - IAD
1 stop11h 15mVirgin Atlantic
Mon 22/907:20IAD - SOU
2 stops20h 25mVirgin Atlantic
Deal found 16/7£545
Mon 8/909:20SOU - IAD
1 stop11h 15mKLM
Sun 14/917:25IAD - SOU
1 stop10h 20mKLM
Deal found 16/7£575
Fri 29/809:40SOU - IAD
1 stop14h 15mAer Lingus
Fri 5/920:25IAD - SOU
1 stop14h 20mAer Lingus
Deal found 15/7£623
Wed 20/809:20SOU - IAD
1 stop11h 15mDelta
Sun 24/820:23IAD - SOU
2 stops15h 37mDelta
Deal found 16/7£651
Fri 29/809:40SOU - IAD
2 stops34h 45mMultiple Airlines
Fri 5/909:35IAD - SOU
2 stops25h 10mMultiple Airlines
Deal found 15/7£686
Mon 1/909:40SOU - IAD
1 stop14h 15mBritish Airways
Sun 5/1019:25IAD - SOU
2 stops15h 35mBritish Airways
Deal found 16/7£745

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 17 July 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

Mon 15/9

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Mon 22/9

07:20-08:45

2 stops20h 25m

£545

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 8/9

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Sun 14/9

17:25-08:45

1 stop10h 20m

£575

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 29/8

09:40-18:55

1 stop14h 15m

Washington, D.C. Dulles Intl

Fri 5/9

20:25-15:45

1 stop14h 20m

£623

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 20/8

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Mon 25/8

17:25-08:50

1 stop10h 25m

£651

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 29/8

09:40-15:25

2 stops34h 45m

Washington, D.C. Dulles Intl

Fri 5/9

09:35-15:45

2 stops25h 10m

£686

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 1/9

09:40-18:55

1 stop14h 15m

Washington, D.C. Dulles Intl

Sun 5/10

19:25-16:00

2 stops15h 35m

£745

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 20/10

08:10-15:06

3 stops35h 56m

£420

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 20/10

09:40-15:50

1 stop11h 10m

£498

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 14/9

09:10-15:50

1 stop11h 40m

£1,332

Flights are sorted by cheapest return flights first.

Deals found on 15/7

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 £599). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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 17 July 2025.
See what other customers who have flown with Delta, KLM, andVirgin Atlantic 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.
Delta
8.0
Very Good
7,957 reviews
Check prices

Food

7.3

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very Good
7,957 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Food

7.3

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,373 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Food

7.3

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Food

7.3

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Aer Lingus
7.1
Good
1,168 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Food

7.3

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
British Airways
6.6
Okay
7,145 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Food

7.3

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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.

  • What are the cheapest airlines flying 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 £545. Other airlines that can offer you cheap pricing are KLM, from £575, and Aer Lingus, from £623.

  • 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 £599). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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
Arlington
Woodbridge
College Park
Laurel
Tysons

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.

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

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How does Cheapflights help users find flights from Southampton to Dulles Intl?

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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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