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Cheap flights from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport 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. Dulles Intl Airport to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:40 pm - 2:50 pmIAD-SEN
14h 10m2 stops
Multiple Airlines Logo
6:40 am - 7:30 pmSEN-IAD
16h 50m2 stops
$792Multiple Airlines
Find Deal
Sun, Mar 22 - Fri, Mar 27
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
6:00 pm - 12:50 pmIAD-SEN
13h 50m2 stops
Multiple Airlines Logo
7:10 am - 9:00 pmSEN-IAD
18h 50m2 stops
$903Multiple Airlines
Find Deal
Thu, Jan 15 - Sun, Jan 18
Multiple Airlines Logo
6:00 pm - 12:50 pmIAD-SEN
13h 50m2 stops
Multiple Airlines Logo
8:20 pm - 9:00 pmSEN-IAD
29h 40m2 stops
$926Multiple Airlines
Find Deal
Thu, Feb 12 - Tue, Feb 17
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
6:05 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. Dulles Intl Airport 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 2, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Southend Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Sun 3/22

8:40 pm-2:50 pm

2 stops14h 10m

London Southend

Fri 3/27

6:40 am-7:30 pm

2 stops16h 50m

$792

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

Thu 1/15

6:00 pm-12:50 pm

2 stops13h 50m

London Southend

Sun 1/18

7:10 am-9:00 pm

2 stops18h 50m

$903

Washington, D.C.London

IAD - SEN

IADSEN

Washington, D.C. Dulles Intl

Thu 2/12

6:00 pm-12:50 pm

2 stops13h 50m

London Southend

Tue 2/17

8:20 pm-9:00 pm

2 stops29h 40m

$926

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

6:05 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

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
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When to book flights from Washington, D.C. Dulles Intl Airport to London Southend Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to London Southend Airport (IAD to SEN) flight deals and tips

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

Fastest flight time

13h 50m

Direct flights

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

    London Southend is 3709.0 mi away from Washington, D.C. Dulles Intl. A reasonable flight in good conditions will take 13h 50m.

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

    Prices for flights from Washington, D.C. Dulles Intl Airport to London Southend Airport are updated daily.

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to London Southend Airport.

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

    The travel and health documents required for your trip to London Southend Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Southend Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • How do I get Price Alerts for flights from Washington, D.C. Dulles Intl Airport to London Southend Airport?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Washington, D.C. Dulles Intl Airport from London Southend Airport. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from Washington, D.C. Dulles Intl Airport to London Southend Airport with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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?

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

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

All flight searches from Washington, D.C. to London 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 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?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Washington, D.C. and alert you when they change.

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