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Cheap flights from Washington, D.C. to London from $315

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 9/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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
8:20 pm - 7:35 pm
IAD
-
SEN
18h 15m
2 stops
Multiple Airlines Logo
4:50 pm - 5:00 pm
SEN
-
IAD
29h 10m
2 stops
$690Multiple Airlines
Thu, Sep 17 - Wed, Sep 23
Multiple Airlines Logo
5:05 pm - 11:20 pm
IAD
-
SEN
25h 15m
2 stops
Multiple Airlines Logo
8:25 pm - 8:35 pm
SEN
-
IAD
29h 10m
2 stops
$755Multiple Airlines
Sat, Sep 19 - Tue, Sep 29
Multiple Airlines Logo
10:35 pm - 9:50 pm
IAD
-
SEN
18h 15m
2 stops
Multiple Airlines Logo
6:30 am - 8:35 pm
SEN
-
IAD
19h 05m
2 stops
$785Multiple Airlines
Wed, Aug 19 - Tue, Sep 1
Multiple Airlines Logo
8:30 pm - 7:40 pm
BWI
-
SEN
18h 10m
2 stops
Multiple Airlines Logo
7:35 am - 7:25 pm
SEN
-
BWI
16h 50m
2 stops
$1,082Multiple Airlines
Tue, Jul 21 - Sun, Jul 26
Multiple Airlines Logo
11:20 pm - 7:10 pm
BWI
-
SEN
14h 50m
2 stops
Multiple Airlines Logo
7:35 am - 7:25 pm
SEN
-
BWI
16h 50m
2 stops
$1,187Multiple Airlines
Thu, Jul 23 - Sun, Jul 26
Multiple Airlines Logo
10:35 pm - 10:20 pm
IAD
-
SEN
18h 45m
2 stops
Multiple Airlines Logo
7:00 am - 8:35 pm
SEN
-
IAD
18h 35m
2 stops
$1,196Multiple Airlines
Tue, Aug 4 - Tue, Aug 25
Multiple Airlines Logo
6:15 pm - 1:00 pm
IAD
-
SEN
13h 45m
1 stop
Multiple Airlines Logo
7:25 am - 4:05 pm
SEN
-
IAD
13h 40m
1 stop
$1,399Multiple Airlines
Wed, Sep 2 - Sun, Sep 6

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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 July 12, 2026.
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

Cheapest round-trip

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Thu 9/17

8:20 pm-7:35 pm

2 stops18h 15m

London Southend

Wed 9/23

4:50 pm-5:00 pm

2 stops29h 10m

$690

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sat 9/19

5:05 pm-11:20 pm

2 stops25h 15m

London Southend

Tue 9/29

8:25 pm-8:35 pm

2 stops29h 10m

$755

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Wed 8/19

10:35 pm-9:50 pm

2 stops18h 15m

London Southend

Tue 9/1

6:30 am-8:35 pm

2 stops19h 05m

$785

BaltimoreLondon

BWI - SEN

BWISEN

Baltimore/Washington

Tue 7/21

8:30 pm-7:40 pm

2 stops18h 10m

London Southend

Sun 7/26

7:35 am-7:25 pm

2 stops16h 50m

$1,082

BaltimoreLondon

BWI - SEN

BWISEN

Baltimore/Washington

Thu 7/23

11:20 pm-7:10 pm

2 stops14h 50m

London Southend

Sun 7/26

7:35 am-7:25 pm

2 stops16h 50m

$1,187

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Tue 8/4

10:35 pm-10:20 pm

2 stops18h 45m

London Southend

Tue 8/25

7:00 am-8:35 pm

2 stops18h 35m

$1,196
Quickest round-trip

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Wed 9/2

6:15 pm-1:00 pm

1 stop13h 45m

London Southend

Sun 9/6

7:25 am-4:05 pm

1 stop13h 40m

$1,399
Cheapest one-way

BaltimoreLondon

BWI - SEN

BWISEN

Baltimore/Washington

Mon 9/7

8:48 pm-1:00 pm

2 stops59h 12m

$315

BaltimoreLondon

BWI - SEN

BWISEN

Baltimore/Washington

Fri 9/11

7:34 pm-10:30 am

2 stops57h 56m

$327
Quickest one-way

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Thu 8/27

8:30 pm-7:10 pm

3 stops17h 40m

$348

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first
1
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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

14h 50m

Direct flights

None
The fastest flight from Washington, D.C. to London Southend Airport takes 14h 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.
Search flight deals

Frequently asked questions about flying from Washington, D.C. to London Southend Airport

  • 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 14h 50m.

  • 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
Hounslow
Gatwick
Milton Keynes
Luton
Hayes
Dover
Crawley
Wembley
Croydon
Stansted
Harrow
Slough
Watford
Brentwood
Ilford
Cobham
Folkestone
Guildford
Romford
Uxbridge

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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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