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Cheap flights from Washington, D.C. to London from $365

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 12/8. 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

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:10 pm - 12:50 pmDCA-SEN
15h 40m2 stops
Multiple Airlines Logo
7:15 am - 6:05 pmSEN-DCA
15h 50m2 stops
$723Multiple Airlines
Find Deal
Thu, Jan 15 - Mon, Jan 19
Multiple Airlines Logo
8:40 pm - 2:50 pmIAD-SEN
14h 10m2 stops
Multiple Airlines Logo
7:15 am - 7:30 pmSEN-IAD
16h 15m2 stops
$866Multiple Airlines
Find Deal
Sun, Mar 8 - Sat, Mar 14
Multiple Airlines Logo
8:30 pm - 5:05 pmIAD-SEN
15h 35m2 stops
Multiple Airlines Logo
7:10 am - 10:00 pmSEN-IAD
18h 50m2 stops
$883Multiple Airlines
Find Deal
Sat, Mar 7 - Sun, Mar 15
Multiple Airlines Logo
5:05 pm - 2:50 pmIAD-SEN
16h 45m2 stops
Multiple Airlines Logo
7:35 am - 7:30 pmSEN-IAD
16h 55m2 stops
$977Multiple Airlines
Find Deal
Sun, Dec 14 - Tue, Dec 16
Multiple Airlines Logo
7:40 pm - 8:50 pmIAD-SEN
20h 10m2 stops
Multiple Airlines Logo
7:15 am - 6:30 pmSEN-IAD
16h 15m2 stops
$1,087Multiple Airlines
Find Deal
Sat, Jan 3 - Mon, Jan 19
Multiple Airlines Logo
6:50 pm - 10:30 amIAD-SEN
10h 40m1 stop
Multiple Airlines Logo
7:10 am - 7:30 pmSEN-IAD
17h 20m1 stop
$2,291Multiple Airlines
Find Deal
Sun, Dec 21 - Wed, Dec 31
Multiple Airlines Logo
6:05 pm - 2:50 pmIAD-SEN
15h 45m1 stop
Multiple Airlines Logo
7:15 am - 4:05 pmSEN-IAD
13h 50m1 stop
$3,360Multiple Airlines
Find Deal
Sun, Dec 21 - Sat, Jan 3

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to London Southend Airport 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 December 3, 2025.
Use the filters below to find and compare flights from Washington, D.C. to London Southend Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

DCA - SEN

DCASEN

Washington, D.C. Reagan-National

Thu 1/15

4:10 pm-12:50 pm

2 stops15h 40m

London Southend

Mon 1/19

7:15 am-6:05 pm

2 stops15h 50m

$723

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sun 3/8

8:40 pm-2:50 pm

2 stops14h 10m

London Southend

Sat 3/14

7:15 am-7:30 pm

2 stops16h 15m

$866

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sat 3/7

8:30 pm-5:05 pm

2 stops15h 35m

London Southend

Sun 3/15

7:10 am-10:00 pm

2 stops18h 50m

$883

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sun 12/14

5:05 pm-2:50 pm

2 stops16h 45m

London Southend

Tue 12/16

7:35 am-7:30 pm

2 stops16h 55m

$977

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sat 1/3

7:40 pm-8:50 pm

2 stops20h 10m

London Southend

Mon 1/19

7:15 am-6:30 pm

2 stops16h 15m

$1,087

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sun 12/21

6:50 pm-10:30 am

1 stop10h 40m

London Southend

Wed 12/31

7:10 am-7:30 pm

1 stop17h 20m

$2,291

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sun 12/21

6:05 pm-2:50 pm

1 stop15h 45m

London Southend

Sat 1/3

7:15 am-4:05 pm

1 stop13h 50m

$3,360

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Mon 12/8

8:45 pm-10:25 pm

2 stops20h 40m

$365

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Tue 1/20

5:30 pm-12:00 pm

2 stops37h 30m

$366

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sat 3/14

6:30 pm-10:30 am

3 stops36h 00m

$368

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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 London Southend Airport

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

How long does it take to fly to London Southend Airport?

Flight times from Washington, D.C. to London Southend Airport vary, but if you’re flying out of Baltimore and flying into London Heathrow Airport (one of the most popular routes), then the duration is 7h 05m on average. Another popular route from Washington, D.C. to London Southend Airport is flying from Washington, D.C. to London Heathrow Airport, which will take roughly 8h 12m. Keep in mind that layovers or delays could extend your travel time.

When to book flights from Washington, D.C. to London Southend Airport

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

Cheap Washington, D.C. to London Southend Airport (WAS to SEN) flight deals and tips

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

Fastest flight time

13h 50m

Direct flights

None
The fastest flight from Washington, D.C. to London Southend Airport takes 13h 50m
There are no direct flights from Washington, D.C. to London Southend Airport. There are no popular flight routes from Washington, D.C. to London Southend Airport.
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  • How far is Washington, D.C. to London Southend by plane?

    The straight-line distance from Washington, D.C. to London Southend is 3694.1 mi. A reasonable flight in good conditions will take 10h 40m.

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

    Prices for flights from Washington, D.C. to London Southend Airport were last updated today.

  • How old do you have to be to fly from Washington, D.C. to London Southend 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 London Southend Airport.

  • What documentation or ID do you need to fly to London Southend Airport?

    The necessary travel and health documents for your London Southend Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Brentwood
Wembley
Romford
Watford
Ilford
Cobham
Folkestone
Uxbridge
Stansted
Chelmsford

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Washington, D.C..

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

Yes. All flights to London from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Washington, D.C. to London 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 London right now. Can momondo alert me if prices change?

Price alerts on flights to London from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your London Southend Airport trip

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