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Cheap flights from London to Washington, D.C. from $250

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Washington, D.C. departing on 1/24. 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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Cheap round-trip flights

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TAP AIR PORTUGAL Logo
6:00 am - 3:05 pmLHR-IAD
14h 05m1 stop
TAP AIR PORTUGAL Logo
5:05 pm - 6:50 pmIAD-LHR
20h 45m1 stop
$543TAP AIR PORTUGAL
Find Deal
Tue, Apr 14 - Tue, Apr 28
Multiple Airlines Logo
6:30 am - 6:30 pmSTN-IAD
17h 00m2 stops
Multiple Airlines Logo
7:40 pm - 6:20 pmIAD-STN
17h 40m2 stops
$543Multiple Airlines
Find Deal
Fri, Dec 12 - Mon, Dec 15
Virgin Atlantic Logo
8:40 am - 4:05 pmLHR-IAD
12h 25m1 stop
Virgin Atlantic Logo
10:20 pm - 10:50 amIAD-LHR
7h 30mnonstop
$610Virgin Atlantic
Find Deal
Thu, Dec 11 - Mon, Dec 15
Virgin Atlantic Logo
6:30 am - 4:05 pmLHR-IAD
14h 35m1 stop
Virgin Atlantic Logo
10:57 am - 9:00 amIAD-LHR
17h 03m1 stop
$611Virgin Atlantic
Find Deal
Thu, Dec 11 - Tue, Dec 30
Delta Logo
6:30 am - 7:32 pmLHR-BWI
18h 02m2 stops
Delta Logo
2:41 pm - 11:25 amBWI-LHR
15h 44m1 stop
$633Delta
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Thu, Dec 4 - Sun, Dec 14
Delta Logo
6:30 am - 7:32 pmLHR-BWI
18h 02m2 stops
Delta Logo
7:50 pm - 11:25 amBWI-LHR
10h 35m1 stop
$634Delta
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Thu, Dec 4 - Sun, Dec 14
American Airlines Logo
12:30 pm - 8:15 pmLGW-DCA
36h 45m2 stops
American Airlines Logo
10:15 am - 9:00 amDCA-LGW
17h 45m1 stop
$634American Airlines
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Thu, Dec 4 - Wed, Dec 17
British Airways Logo
11:45 am - 10:02 amLGW-DCA
27h 17m2 stops
British Airways Logo
4:49 pm - 7:00 pmDCA-LGW
21h 11m2 stops
$643British Airways
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Wed, Dec 10 - Mon, Dec 15
American Airlines Logo
11:20 am - 9:15 pmLGW-DCA
14h 55m1 stop
American Airlines Logo
6:42 am - 7:30 amDCA-LGW
19h 48m1 stop
$647American Airlines
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Wed, Dec 10 - Mon, Dec 15
British Airways Logo
11:20 am - 11:34 pmLGW-DCA
17h 14m1 stop
British Airways Logo
11:30 am - 7:30 amDCA-LGW
16h 00m1 stop
$679British Airways
Find Deal
Thu, Feb 26 - Sun, Mar 8

Icelandair flights from London to Washington, D.C.

Our best Icelandair deals on London to Washington, D.C. flight tickets
Icelandair
Feb 2
LHR9:20 amLondon Heathrow
11h 59m
1 stop
DCA4:19 pmWashington, D.C. Reagan-National
Feb 9
DCA11:55 amWashington, D.C. Reagan-National
14h 00m
1 stop
LHR6:55 amLondon Heathrow
$551
Find similar
Icelandair
Feb 2
LHR9:20 amLondon Heathrow
17h 31m
1 stop
DCA9:51 pmWashington, D.C. Reagan-National
Feb 9
DCA6:15 amWashington, D.C. Reagan-National
9h 30m
1 stop
LHR8:45 pmLondon Heathrow
$552
Find similar
Icelandair
Feb 2
LHR12:20 pmLondon Heathrow
15h 27m
1 stop
DCA10:47 pmWashington, D.C. Reagan-National
Feb 9
DCA6:15 amWashington, D.C. Reagan-National
9h 30m
1 stop
LHR8:45 pmLondon Heathrow
$553
Find similar

American Airlines flights from London to Washington, D.C.

Our best American Airlines deals on London to Washington, D.C. flight tickets
American Airlines
Dec 4
LGW12:30 pmLondon Gatwick
36h 45m
2 stops
DCA8:15 pmWashington, D.C. Reagan-National
Dec 17
DCA10:15 amWashington, D.C. Reagan-National
17h 45m
1 stop
LGW9:00 amLondon Gatwick
$634
Find similar
American Airlines
Dec 10
LGW11:20 amLondon Gatwick
14h 55m
1 stop
DCA9:15 pmWashington, D.C. Reagan-National
Dec 15
DCA6:42 amWashington, D.C. Reagan-National
19h 48m
1 stop
LGW7:30 amLondon Gatwick
$647
Find similar
American Airlines
Dec 10
LGW11:20 amLondon Gatwick
17h 14m
2 stops
DCA11:34 pmWashington, D.C. Reagan-National
Dec 15
DCA6:42 amWashington, D.C. Reagan-National
19h 48m
1 stop
LGW7:30 amLondon Gatwick
$650
Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 4/14

6:00 am-3:05 pm

1 stop14h 05m

Washington, D.C. Dulles Intl

Tue 4/28

5:05 pm-6:50 pm

1 stop20h 45m

$543

LondonWashington, D.C.

STN - IAD

STNIAD

London Stansted

Fri 12/12

6:30 am-6:30 pm

2 stops17h 00m

Washington, D.C. Dulles Intl

Mon 12/15

7:40 pm-6:20 pm

2 stops17h 40m

$543

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 12/11

8:40 am-4:05 pm

1 stop12h 25m

Washington, D.C. Dulles Intl

Mon 12/15

10:20 pm-10:50 am

Nonstop7h 30m

$610

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 12/11

6:30 am-4:05 pm

1 stop14h 35m

Washington, D.C. Dulles Intl

Tue 12/30

10:57 am-9:00 am

1 stop17h 03m

$611

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 12/4

6:30 am-7:32 pm

2 stops18h 02m

Baltimore/Washington

Sun 12/14

2:41 pm-11:25 am

1 stop15h 44m

$633

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 12/4

6:30 am-7:32 pm

2 stops18h 02m

Baltimore/Washington

Sun 12/14

7:50 pm-11:25 am

1 stop10h 35m

$634

LondonWashington, D.C.

LGW - DCA

LGWDCA

London Gatwick

Thu 12/4

12:30 pm-8:15 pm

2 stops36h 45m

Washington, D.C. Reagan-National

Wed 12/17

10:15 am-9:00 am

1 stop17h 45m

$634

LondonWashington, D.C.

LGW - DCA

LGWDCA

London Gatwick

Wed 12/10

11:45 am-10:02 am

2 stops27h 17m

Washington, D.C. Reagan-National

Mon 12/15

4:49 pm-7:00 pm

2 stops21h 11m

$643

LondonWashington, D.C.

LGW - DCA

LGWDCA

London Gatwick

Wed 12/10

11:20 am-9:15 pm

1 stop14h 55m

Washington, D.C. Reagan-National

Mon 12/15

6:42 am-7:30 am

1 stop19h 48m

$647

LondonWashington, D.C.

LGW - DCA

LGWDCA

London Gatwick

Thu 2/26

11:20 am-11:34 pm

1 stop17h 14m

Washington, D.C. Reagan-National

Sun 3/8

11:30 am-7:30 am

1 stop16h 00m

$679

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

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

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 month to fly to Washington, D.C.?

The month of February is, on average, the cheapest month to fly to Washington, D.C. from London, with most prices found around $622. If you’re not able to fly to Washington, D.C. in February, then September is your next best option. Flight prices from London to Washington, D.C. during September average around $640.

What is the cheapest day to depart on your flight to Washington, D.C.?

On average, the least expensive day to fly to Washington, D.C. from London is on a Thursday. momondo users have found tickets for Thursday departures for as low as $777. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from London to Washington, D.C. for around $936.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

In the evening is the cheapest time of day to fly from London to Washington, D.C. when you can find flight prices for as low as $762. Flying to Washington, D.C. in the evening is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $867. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest London to Washington, D.C. flight route?

Fly from London Heathrow to Baltimore/Washington for the best London - Washington, D.C. flight prices

How far in advance should I book a flight to Washington, D.C.?

You are more likely to see cheaper flights to Washington, D.C. from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $781 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from London for as low as $737 on momondo.

What cabin class options are available on London to Washington, D.C. flights?

There are 4 cabin classes available to choose from on London to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Washington, D.C. flights?

No. A direct flight is the cheapest option for a flight between London to Washington, D.C..

How have London to Washington, D.C. flight prices changed over time?

As of November 2025, prices for London to Washington, D.C. flights are approximately 28% more expensive when compared to flights at the same time last year.

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

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

Cheap London to Washington, D.C. (LON to WAS) flight deals and tips

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

Best Price Found

$699

Fastest flight time

8h 15m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from London in the past 72 hours is $699. The best round-trip flight deal from London to Washington, D.C. found on momondo in the last 72 hours is $706.
The fastest flight from London to Washington, D.C. takes 8h 15m
Direct flights go from London to Washington, D.C. every day.
There are 2 airports near Washington, D.C.: Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
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  • How far is London to Washington, D.C. by plane?

    There are 3662.3 mi between London and Washington, D.C.. By plane, this route typically takes 10h 35m.

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

    Prices for flights from London to Washington, D.C. are updated daily.

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

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

    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 London to Washington, D.C..

  • What documentation or ID do you need to fly to Washington, D.C.?

    The travel and health documents you'll need for your trip to Washington, D.C. 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 Washington, D.C.. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London to Washington, D.C.?

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

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

Compare and see reviews for airlines that fly from London to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $320Free CancellationRating
7.9
8,002 reviews
Search Delta flights
Scandinavian AirlinesPriceFrom $390Free CancellationRating
7.4
1,556 reviews
Search Scandinavian Airlines flights
Austrian AirlinesPriceFrom $431Free CancellationRating
7.6
863 reviews
Search Austrian Airlines flights
TAP AIR PORTUGALPriceFrom $473Free CancellationRating
7.1
2,046 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom $510Free CancellationRating
7.1
568 reviews
Search Icelandair flights
American AirlinesPriceFrom $562Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights
United AirlinesPriceFrom $567Free CancellationRating
7.4
8,997 reviews
Search United Airlines flights
British AirwaysPriceFrom $594Free CancellationRating
6.7
7,494 reviews
Search British Airways flights
Air CanadaPriceFrom $635Free CancellationRating
7.1
10,398 reviews
Search Air Canada flights
LufthansaPriceFrom $649Free CancellationRating
6.8
7,545 reviews
Search Lufthansa flights

  • Delta Flights From London to Washington, D.C.

    The lowest priced Delta flight from London to Washington, D.C. from the last 72 hours was $320. Generally, Delta has 8 flights on this route every week with an average price of $968. Delta is rated 7.9/10 by our users.

  • Austrian Airlines Flights From London to Washington, D.C.

    Austrian Airlines (7.6/10 from 863 reviews) operates around 14 flights from London to Washington, D.C. in any given week. The average Austrian Airlines airfare for this route is around $858, with deals from around $431 rare but found on momondo. Referenced prices are for round-trip London to Washington, D.C. flight searches in the last 72 hours.

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Manassas
Reston
Gaithersburg
Fairfax
Glen Burnie
Springfield
Linthicum Heights

Why use momondo?

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

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 Washington, D.C. from London.

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

Yes. momondo allows you to filter the results for London to Washington, D.C. flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from London.

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

Price alerts on flights to Washington, D.C. from London 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 Washington, D.C. 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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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport