In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What is the cheapest time of day to fly from SOU to IAD?

When flying from Southampton to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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.

$1,122+ Flights from Southampton to Washington, D.C. Dulles Intl Airport

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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 December 12, 2025.

Thu 12/118:40 amSOU - IAD

2 stops16h 15mBritish Airways

Thu 12/189:00 pmIAD - SOU

1 stop13h 35mBritish Airways

Deal found 12/10

$2,061

Best flights from Southampton to Dulles Intl
Discover carefully curated flight deals from Southampton to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

Thu 2/58:10 pmSOU - IAD

1 stop24h 25mBritish Airways

Mon 2/95:05 pmIAD - SOU

1 stop13h 50mBritish Airways

Deal found 12/9

$1,122

Last-minute flights from Southampton to Dulles Intl
Discover last-minute flight deals from Southampton to Dulles Intl. Data last updated December 12, 2025 and is based on user searches.

Thu 12/118:40 amSOU - IAD

2 stops16h 15mBritish Airways

Thu 12/189:00 pmIAD - SOU

1 stop13h 35mBritish Airways

Deal found 12/10

$2,061

One-way flights from Southampton to Dulles Intl
Search for one-way flight options from Southampton to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated December 12, 2025.

Mon 12/228:40 amSOU - IAD

2 stops16h 15mBritish Airways

Deal found 12/10

$3,579

Find flight deals from Southampton to Dulles Intl

Most accurate provider	OneTravel 3 stars
Most trusted provider	OneTravel 3 stars
Round-trip from	$1,122 (British Airways)
Popular in	July
Cheapest in	February
Average price	$798

Provider with most accurate pricing for London (LON)-Washington, D.C. (WAS) flight deals.

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Provider most trusted by Cheapflights users for London (LON)-Washington, D.C. (WAS) flights.

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From Southampton Eastleigh to Washington, D.C. Dulles Intl

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Highest demand for flights based on searches. 12% potential increase in price ($106 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).

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Average for round-trip flights in December 2025

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Cheapflights Fare Finder

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

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 2/5

8:10 pm-3:35 pm

1 stop24h 25m

Washington, D.C. Dulles Intl

Mon 2/9

5:05 pm-11:55 am

1 stop13h 50m

$1,122

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 12/22

8:40 am-7:55 pm

2 stops16h 15m

$3,579

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

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, February 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 $710). 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

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 24h 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, February 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 $710). 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.

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$1,122+ 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 2/5. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Southampton to Dulles Intl with Cheapflights

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Cheap flight deals from Southampton to Dulles Intl

Cheapest flights from Southampton to Dulles IntlExplore 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 December 12, 2025.

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 December 12, 2025.

Find flight deals from Southampton to Dulles Intl

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

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.

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?

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?

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

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

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

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

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

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

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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 December 12, 2025.