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Cheap flights from Washington, D.C. to London from $494

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to London departing on 9/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. to London

Cheap round-trip flights

Logo
2:50 pm - 5:00 pmDCA-SOU
21h 10m2 stops
Logo
9:20 am - 10:11 pmSOU-DCA
17h 51m2 stops
$793
Find Deal
Wed, Oct 1 - Sun, Oct 5
KLM Logo
5:25 pm - 5:00 pmIAD-SOU
18h 35m1 stop
KLM Logo
6:25 pm - 3:35 pmSOU-IAD
26h 10m1 stop
$795KLM
Find Deal
Wed, Oct 1 - Sun, Oct 5
KLM Logo
5:25 pm - 8:45 amIAD-SOU
10h 20m1 stop
KLM Logo
9:20 am - 3:35 pmSOU-IAD
11h 15m1 stop
$812KLM
Find Deal
Thu, Oct 9 - Fri, Oct 24
Delta Logo
10:07 am - 8:45 amIAD-SOU
17h 38m2 stops
Delta Logo
6:25 pm - 3:35 pmSOU-IAD
26h 10m1 stop
$814Delta
Find Deal
Wed, Oct 1 - Sun, Oct 5
Delta Logo
7:05 am - 8:20 amIAD-SOU
21h 15m2 stops
Delta Logo
8:40 am - 4:05 pmSOU-IAD
12h 25m1 stop
$816Delta
Find Deal
Wed, Oct 29 - Wed, Nov 5
Delta Logo
12:08 pm - 8:45 amIAD-SOU
15h 37m2 stops
Delta Logo
6:25 pm - 4:29 pmSOU-IAD
27h 04m2 stops
$819Delta
Find Deal
Wed, Oct 1 - Sun, Oct 5
Aer Lingus Logo
9:00 pm - 7:40 pmIAD-SOU
17h 40m1 stop
Aer Lingus Logo
9:30 am - 7:30 pmSOU-IAD
15h 00m1 stop
$977Aer Lingus
Find Deal
Sat, Nov 8 - Sat, Nov 15
Aer Lingus Logo
5:05 pm - 8:45 amIAD-SOU
10h 40m1 stop
Aer Lingus Logo
9:30 am - 4:35 pmSOU-IAD
35h 05m2 stops
$1,050Aer Lingus
Find Deal
Fri, Mar 6 - Sat, Mar 21
British Airways Logo
9:00 pm - 7:40 pmIAD-SOU
17h 40m1 stop
British Airways Logo
8:55 am - 3:35 pmSOU-IAD
35h 40m2 stops
$1,409British Airways
Find Deal
Sat, Nov 8 - Sat, Nov 15
British Airways Logo
5:20 pm - 8:40 amIAD-SOU
10h 20m1 stop
British Airways Logo
8:55 am - 5:30 pmSOU-IAD
13h 35m2 stops
$1,451British Airways
Find Deal
Wed, Oct 1 - Sun, Oct 5

KLM flights from Washington, D.C. to Southampton

Our best KLM deals on Washington, D.C. to Southampton flight tickets
KLM
Oct 1
IAD5:25 pmWashington, D.C. Dulles Intl
18h 35m
1 stop
SOU5:00 pmSouthampton Eastleigh
Oct 5
SOU6:25 pmSouthampton Eastleigh
26h 10m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$795
Find similar
KLM
Oct 9
IAD5:25 pmWashington, D.C. Dulles Intl
10h 20m
1 stop
SOU8:45 amSouthampton Eastleigh
Oct 24
SOU9:20 amSouthampton Eastleigh
11h 15m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$812
Find similar
KLM
Mar 6
IAD6:05 pmWashington, D.C. Dulles Intl
17h 55m
1 stop
SOU5:00 pmSouthampton Eastleigh
Mar 21
SOU5:30 pmSouthampton Eastleigh
27h 35m
1 stop
IAD5:05 pmWashington, D.C. Dulles Intl
$820
Find similar

Delta flights from Washington, D.C. to Southampton

Our best Delta deals on Washington, D.C. to Southampton flight tickets
Delta
Oct 1
IAD10:07 amWashington, D.C. Dulles Intl
17h 38m
2 stops
SOU8:45 amSouthampton Eastleigh
Oct 5
SOU6:25 pmSouthampton Eastleigh
26h 10m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$814
Find similar
Delta
Oct 29
IAD7:05 amWashington, D.C. Dulles Intl
21h 15m
2 stops
SOU8:20 amSouthampton Eastleigh
Nov 5
SOU8:40 amSouthampton Eastleigh
12h 25m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$816
Find similar
Delta
Oct 1
IAD12:08 pmWashington, D.C. Dulles Intl
15h 37m
2 stops
SOU8:45 amSouthampton Eastleigh
Oct 5
SOU6:25 pmSouthampton Eastleigh
27h 04m
2 stops
IAD4:29 pmWashington, D.C. Dulles Intl
$819
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Southampton 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, momondo users made 832,500 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Southampton that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Southampton

DCA - SOU

DCASOU

Washington, D.C. Reagan-National

Wed 10/1

2:50 pm-5:00 pm

2 stops21h 10m

Southampton Eastleigh

Sun 10/5

9:20 am-10:11 pm

2 stops17h 51m

$793

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/1

5:25 pm-5:00 pm

1 stop18h 35m

Southampton Eastleigh

Sun 10/5

6:25 pm-3:35 pm

1 stop26h 10m

$795

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 10/9

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Fri 10/24

9:20 am-3:35 pm

1 stop11h 15m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/1

10:07 am-8:45 am

2 stops17h 38m

Southampton Eastleigh

Sun 10/5

6:25 pm-3:35 pm

1 stop26h 10m

$814

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/29

7:05 am-8:20 am

2 stops21h 15m

Southampton Eastleigh

Wed 11/5

8:40 am-4:05 pm

1 stop12h 25m

$816

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/1

12:08 pm-8:45 am

2 stops15h 37m

Southampton Eastleigh

Sun 10/5

6:25 pm-4:29 pm

2 stops27h 04m

$819

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sat 11/8

9:00 pm-7:40 pm

1 stop17h 40m

Southampton Eastleigh

Sat 11/15

9:30 am-7:30 pm

1 stop15h 00m

$977

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Fri 3/6

5:05 pm-8:45 am

1 stop10h 40m

Southampton Eastleigh

Sat 3/21

9:30 am-4:35 pm

2 stops35h 05m

$1,050

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sat 11/8

9:00 pm-7:40 pm

1 stop17h 40m

Southampton Eastleigh

Sat 11/15

8:55 am-3:35 pm

2 stops35h 40m

$1,409

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/1

5:20 pm-8:40 am

1 stop10h 20m

Southampton Eastleigh

Sun 10/5

8:55 am-5:30 pm

2 stops13h 35m

$1,451

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Washington, D.C. to Southampton

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Southampton?

On average, the least expensive day to fly to Southampton from Washington, D.C. is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $859. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. to Southampton for around $1,103.

What is the cheapest time of day to depart on your flight to Southampton?

Flying to Southampton from Washington, D.C. in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $936 when looking at flights departing in the afternoon. Flights to Southampton are more costly in the morning, with an average ticket price of $1,201. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Washington, D.C. to Southampton

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Southampton according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Southampton (WAS to SOU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Southampton

Direct flights

None
There are no direct flights from Washington, D.C. to Southampton. There are no popular flight routes from Washington, D.C. to Southampton.
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  • How far is Washington, D.C. to Southampton Eastleigh by plane?

    Washington, D.C. and Southampton Eastleigh are 3622.6 mi apart from one another. A reasonable flight in good conditions will take 10h 15m.

  • When did momondo last update prices for flights from Washington, D.C. to Southampton Eastleigh Airport?

    Prices for flights from Washington, D.C. to Southampton Eastleigh Airport were last updated today.

  • How many operators does momondo search for flights from Washington, D.C. to Southampton Eastleigh Airport?

  • How old do you have to be to fly from Washington, D.C. to Southampton Eastleigh Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Southampton Eastleigh Airport.

  • What documentation or ID do you need to fly to Southampton Eastleigh Airport?

    The travel and health documents you'll need for your trip to Southampton Eastleigh Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Southampton Eastleigh Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Washington, D.C. to Southampton?

Best airlines flying from Washington, D.C. to Southampton

Compare and see reviews for airlines that fly from Washington, D.C. to Southampton with momondo
Airline
Rating
Free Cancellation
Price
Aer LingusPriceFrom $677Free CancellationRating
7.2
1,270 reviews
Search Aer Lingus flights
DeltaPriceFrom $778Free CancellationRating
7.9
7,954 reviews
Search Delta flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Portsmouth

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Southampton?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington, D.C. to Southampton. momondo saves you time and could save you money on your trip.

Can I find flights from Washington, D.C. to Southampton with flexible booking policies on momondo?

All flight searches from Washington, D.C. to Southampton on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Washington, D.C. to Southampton?

Once all potential Washington, D.C. to Southampton flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Washington, D.C. to Southampton right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Washington, D.C. to Southampton flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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