$645 Cheap Flights from Southampton (SOU) to Washington (DCA)

View $645 flight on Sun, Dec 14, 2025Opens in a new window

Popular airlines from Southampton (SOU) to Ronald Reagan Washington National Airport (DCA)

Cheap Flights from Southampton to Washington (SOU-DCA)

Prices were available within the past 7 days and start at $645 for one-way flights and $1,125 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,125 Roundtrip, found 6 days ago
$1,125
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,125 found 6 days ago
KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,145 Roundtrip, found 6 days ago
$1,145
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,145 found 6 days ago
KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,152 Roundtrip, found 6 days ago
$1,152
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,152 found 6 days ago
KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,172 Roundtrip, found 6 days ago
$1,172
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,172 found 6 days ago
KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,207 Roundtrip, found 6 days ago
$1,207
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,207 found 6 days ago
KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,227 Roundtrip, found 6 days ago
$1,227
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,227 found 6 days ago
KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,234 Roundtrip, found 6 days ago
$1,234
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,234 found 6 days ago
Aer Lingus
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,251 Roundtrip, found 6 days ago
$1,251
Roundtrip
found 6 days ago
Select Aer Lingus flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,251 found 6 days ago
KLM
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,254 Roundtrip, found 6 days ago
$1,254
Roundtrip
found 6 days ago
Select KLM flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,254 found 6 days ago
Aer Lingus
Sat, Nov 1 - Sat, Nov 8
SOU
Southampton
DCA
Washington
$1,260 Roundtrip, found 6 days ago
$1,260
Roundtrip
found 6 days ago
Select Aer Lingus flight, departing Sat, Nov 1 from Southampton to Washington, returning Sat, Nov 8, priced at $1,260 found 6 days ago

Frequently asked questions

How much does a flight from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA) cost?
Get a cheap one-way flight from $645 or cheap return flight from $1,125 from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA)?
The cheapest month to fly from SOU to DCA is November, when demand is low. Off-peak months are typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA)?
To find the cheapest airline flying from SOU to DCA, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA)?
There aren't any daily nonstop flights from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA). But you can opt for flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from SOU to DCA?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA)?
To arrive at Ronald Reagan Washington National Airport (DCA) on schedule, opt for a flight that leaves Southampton Airport (SOU) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA) last-minute?
Holding off until just before your trip to book a ticket from SOU to DCA often results in higher prices. While you might find some last-minute deals, they're not always guaranteed. Be flexible with your travel plans for a better chance of snagging a bargain.
Is it cheaper to book a SOU to DCA flight and hotel package?
Securing a SOU to DCA flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Choose from our impressive range of accommodations and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Southampton Airport (SOU) to Ronald Reagan Washington National Airport (DCA)?
In most instances, you're able to cancel or reschedule your SOU to DCA flight. However, additional fees may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you'd like further information, visit our Customer Service portal.

Travel information

Origin airport
Southampton
Destination airport
Ronald Reagan Washington National
Roundtrip price
$1,125
Distance
3628 mi

Book with confidence

Southampton to Washington Flights

The cheapest times to fly from Southampton to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Southampton to Washington are during the month of November. You can find some of the cheapest flights from Southampton to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Southampton to Washington

Sunday is one of the best days to book for cheap flights from Southampton to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Southampton to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Southampton to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $645 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Southampton to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Southampton to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Southampton to Washington Flights

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*Available to One Key members.