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Cheap flights from Southampton to Washington, D.C. Dulles Intl Airport from £375

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — IAD
16 jul — 23 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 11 julho 2025.

Round-trip from

£650

One-way from

£375

Popular in

July

Cheapest in

February

Average price

£657
Delta
  • Delta
  • 19/8-25/8
  • 2 total stops
  • 44h 45m total
  • Southampton to Washington, D.C.
15/9
  • 15/9
  • 3 total stops
  • 36h 01m total
  • Southampton to Washington, D.C.
Highest demand for flights based on searches. 14% potential increase in price (£66 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Average for round-trip flights in July 2025

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 11 julho 2025.

ter 19/818:25SOU - IAD
1 stop26h 10mDelta
seg 25/817:25IAD - SOU
1 stop18h 35mDelta
Deal found 10/7£650
sáb 23/809:20SOU - IAD
2 stops14h 55mMultiple Airlines
sáb 30/817:25IAD - SOU
1 stop16h 35mMultiple Airlines
Deal found 9/7£752
sáb 23/809:40SOU - IAD
1 stop11h 10mAer Lingus
sáb 30/817:20IAD - SOU
1 stop10h 15mAer Lingus
Deal found 9/7£828
seg 18/809:40SOU - IAD
1 stop11h 10mBritish Airways
ter 26/817:20IAD - SOU
1 stop9h 45mBritish Airways
Deal found 10/7£922
qua 16/709:20SOU - IAD
1 stop11h 15mKLM
dom 20/717:25IAD - SOU
1 stop10h 20mKLM
Deal found 10/7£1,519

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 11 julho 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

ter 19/8

18:25-15:35

1 stop26h 10m

Washington, D.C. Dulles Intl

dom 24/8

20:23-17:00

2 stops15h 37m

£650

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

sáb 23/8

09:20-19:15

2 stops14h 55m

Washington, D.C. Dulles Intl

sáb 30/8

17:25-15:00

1 stop16h 35m

£752

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

sáb 23/8

09:40-15:50

1 stop11h 10m

Washington, D.C. Dulles Intl

sáb 30/8

17:20-08:35

1 stop10h 15m

£828

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

seg 18/8

09:40-15:50

1 stop11h 10m

Washington, D.C. Dulles Intl

ter 26/8

17:20-08:05

1 stop9h 45m

£922

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

seg 15/9

08:05-15:06

3 stops36h 01m

£375

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

dom 14/9

09:10-18:55

1 stop14h 45m

£444

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

seg 8/9

09:40-18:55

1 stop14h 15m

£1,281

Flights are sorted by cheapest return flights first.

Deals found on 9/7

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 11 julho 2025.
See what other customers who have flown with Delta, Aer Lingus, andBritish Airways 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.

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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.
8.0
Very Good

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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.

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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.

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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 £650. Other airlines that can offer you cheap pricing are Aer Lingus, from £828, and British Airways, from £922.

  • 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

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Alternative routes for Southampton to Dulles Intl

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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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