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Dulles Intl

$676+ Cheap flights from Southampton (SOU) to Dulles Intl (IAD)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — IAD
Apr 10 — Apr 171
Fri 4/10
Fri 4/17
1 adult, Economy
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Cheap 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 March 11, 2026.

This Expedia deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/259:20 am
SOU
-
IAD
1 stop11h 25m
Aer Lingus
Sat 5/28:40 pm
IAD
-
SOU
1 stop17h 50m
Aer Lingus
Deal found 3/11$676
This Mytrip deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/248:00 pm
SOU
-
IAD
1 stop24h 45m
Aer Lingus
Fri 5/18:55 pm
IAD
-
SOU
1 stop17h 35m
Aer Lingus
Deal found 3/9$769
This Expedia deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/248:55 am
SOU
-
IAD
2 stops15h 30m
Multiple Airlines
Fri 5/15:15 pm
IAD
-
SOU
1 stop10h 25m
Multiple Airlines
Deal found 3/9$851
This Gotogate deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/256:50 am
SOU
-
IAD
2 stops17h 20m
Multiple Airlines
Sat 5/28:40 pm
IAD
-
SOU
1 stop17h 50m
Multiple Airlines
Deal found 3/11$854
This oojo deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/308:00 pm
SOU
-
IAD
1 stop24h 45m
Aer Lingus
Mon 4/65:15 pm
IAD
-
SOU
1 stop10h 25m
Aer Lingus
Deal found 3/8$938
This British Airways deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/159:20 am
SOU
-
IAD
1 stop11h 25m
British Airways
Sun 4/195:15 pm
IAD
-
SOU
1 stop10h 25m
British Airways
Deal found 3/9$979

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 March 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$769
(Mytrip)

One-way from

$708
(British Airways)

Popular in

July

Cheapest in

February

Average price

$686
Provider with most accurate pricing for London (LON)-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Washington, D.C. (WAS) flights.
Search Deals
From Southampton Eastleigh to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Southampton Eastleigh to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($103 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated March 11, 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 round-trip

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sat 4/25

6:50 am-7:10 pm

2 stops17h 20m

Washington, D.C. Dulles Intl

Sat 5/2

8:40 pm-7:30 pm

1 stop17h 50m

$854
Quickest round-trip

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 4/15

9:20 am-3:45 pm

1 stop11h 25m

Washington, D.C. Dulles Intl

Sun 4/19

5:15 pm-8:40 am

1 stop10h 25m

$979
Cheapest one-way

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 4/29

9:20 am-7:25 pm

1 stop15h 05m

$708

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 5/1

6:50 am-5:25 pm

2 stops15h 35m

$818

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 4/30

9:20 am-7:10 pm

1 stop14h 50m

$819

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 7/5

8:45 pm-3:50 pm

2 stops24h 05m

$912

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 4/24

9:20 am-7:25 pm

1 stop15h 05m

$970
Quickest one-way

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sat 4/25

9:20 am-3:45 pm

1 stop11h 25m

$970

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 4/28

9:20 am-7:35 pm

1 stop15h 15m

$970

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sat 5/2

9:20 am-7:10 pm

1 stop14h 50m

$1,166

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/9

Showing 1-10 of 11 resultsSorted by cheapest first
1
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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 round-trip 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 $449). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $615). 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?

    If you book a flight to Washington, D.C. Dulles Intl from Southampton, you will be flying from Eastleigh, which is the city’s only airport. Southampton Eastleigh (SOU) is located 3.5 mi from the center of Southampton. There are 0 flights from Eastleigh to Washington, D.C. Dulles Intl per day from 0 different airlines.

  • How long is the flight from Southampton to Washington, D.C. Dulles Intl Airport?

    There are many flights that can get you from Southampton to Washington, D.C. Dulles Intl Airport in 11h 25m. Fly via British Airways to get the fastest option. There are 3639 mi between Southampton and Washington, D.C. Dulles Intl Airport.

  • 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 vacation 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 $449). Flying from Southampton to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $615). 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

Traveling 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
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Linthicum Heights
Fredericksburg
Largo
Bowie
Clinton
Towson
College Park

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