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Cheap flights from London to Washington, D.C. from £374

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 22/9. 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 return flights

Logo
06:55 - 19:25LHR-IAD
17h 30m1 stop
Logo
17:37 - 06:30IAD-LHR
31h 53m1 stop
£392
Find Deal
Fri, 26 Sep - Sat, 4 Oct
United Airlines Logo
09:00 - 17:40LHR-IAD
12h 40m1 stop
United Airlines Logo
17:33 - 09:10IAD-LHR
10h 37m1 stop
£394United Airlines
Find Deal
Tue, 28 Oct - Tue, 11 Nov
Virgin Atlantic Logo
08:40 - 23:03LHR-IAD
19h 23m2 stops
Virgin Atlantic Logo
10:08 - 06:45IAD-LHR
15h 37m2 stops
£394Virgin Atlantic
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Thu, 13 Nov - Thu, 18 Dec
British Airways Logo
16:25 - 19:55LHR-IAD
8h 30mdirect
British Airways Logo
18:20 - 06:30IAD-LHR
7h 10mdirect
£400British Airways
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Fri, 21 Nov - Tue, 25 Nov
British Airways Logo
16:25 - 19:55LHR-IAD
8h 30mdirect
British Airways Logo
18:20 - 06:30IAD-LHR
7h 10mdirect
£401British Airways
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Fri, 14 Nov - Fri, 28 Nov
Icelandair Logo
15:35 - 22:10LGW-IAD
11h 35m1 stop
Icelandair Logo
20:30 - 14:40IAD-LGW
13h 10m1 stop
£401Icelandair
Find Deal
Wed, 24 Sep - Wed, 1 Oct
Virgin Atlantic Logo
12:35 - 16:00LHR-IAD
8h 25mdirect
Virgin Atlantic Logo
18:45 - 07:15IAD-LHR
7h 30mdirect
£404Virgin Atlantic
Find Deal
Thu, 2 Oct - Sat, 18 Oct
Icelandair Logo
15:40 - 19:20LGW-IAD
32h 40m1 stop
Icelandair Logo
23:15 - 14:40IAD-LGW
10h 25m1 stop
£404Icelandair
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Thu, 2 Oct - Sun, 5 Oct
Lufthansa Logo
09:40 - 20:15LCY-IAD
15h 35m1 stop
Lufthansa Logo
22:00 - 17:40IAD-LCY
14h 40m1 stop
£423Lufthansa
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Thu, 6 Nov - Mon, 10 Nov
Lufthansa Logo
09:40 - 20:15LCY-IAD
15h 35m1 stop
Lufthansa Logo
23:00 - 16:40IAD-LCY
13h 40m1 stop
£424Lufthansa
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Thu, 5 Mar - Thu, 12 Mar

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

Our best Brussels Airlines deals on London to Washington, D.C. Dulles Intl Airport flight tickets
Brussels Airlines
18 Sept
LHR07:45London Heathrow
10h 45m
1 stop
IAD13:30Washington, D.C. Dulles Intl
2 Nov
IAD15:59Washington, D.C. Dulles Intl
36h 41m
1 stop
LHR09:40London Heathrow
£403
Find similar
Brussels Airlines
27 Oct
LHR17:50London Heathrow
25h 45m
1 stop
IAD15:35Washington, D.C. Dulles Intl
12 Dec
IAD17:15Washington, D.C. Dulles Intl
35h 25m
1 stop
LHR09:40London Heathrow
£413
Find similar

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

Our best American Airlines deals on London to Washington, D.C. Dulles Intl Airport flight tickets
American Airlines
21 Nov
LHR16:25London Heathrow
8h 30m
IAD19:55Washington, D.C. Dulles Intl
2 Dec
IAD21:45Washington, D.C. Dulles Intl
7h 15m
LHR10:00London Heathrow
£416
Find similar
American Airlines
3 Oct
LHR11:00London Heathrow
12h 51m
1 stop
IAD18:51Washington, D.C. Dulles Intl
6 Oct
IAD17:41Washington, D.C. Dulles Intl
10h 24m
1 stop
LHR09:05London Heathrow
£427
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momondo Fare Finder

 
Customise your flight search to find flights from London to Washington, D.C. Dulles Intl 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 279,928 searches. Data last updated 12 September 2025.
Use the filters below to find and compare flights from London to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 26/9

06:55-19:25

1 stop17h 30m

Washington, D.C. Dulles Intl

Sat 4/10

17:37-06:30

1 stop31h 53m

£392

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 28/10

09:00-17:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Tue 11/11

17:33-09:10

1 stop10h 37m

£394

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 13/11

08:40-23:03

2 stops19h 23m

Washington, D.C. Dulles Intl

Thu 18/12

10:08-06:45

2 stops15h 37m

£394

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 21/11

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Tue 25/11

18:20-06:30

Nonstop7h 10m

£400

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 14/11

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Fri 28/11

18:20-06:30

Nonstop7h 10m

£401

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Wed 24/9

15:35-22:10

1 stop11h 35m

Washington, D.C. Dulles Intl

Wed 1/10

20:30-14:40

1 stop13h 10m

£401

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 2/10

12:35-16:00

Nonstop8h 25m

Washington, D.C. Dulles Intl

Sat 18/10

18:45-07:15

Nonstop7h 30m

£404

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 2/10

15:40-19:20

1 stop32h 40m

Washington, D.C. Dulles Intl

Sun 5/10

23:15-14:40

1 stop10h 25m

£404

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Thu 6/11

09:40-20:15

1 stop15h 35m

Washington, D.C. Dulles Intl

Mon 10/11

22:00-17:40

1 stop14h 40m

£423

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Thu 5/3

09:40-20:15

1 stop15h 35m

Washington, D.C. Dulles Intl

Thu 12/3

23:00-16:40

1 stop13h 40m

£424

Flights are sorted by cheapest return 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. Dulles Intl 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

What is the typical price of a round-trip flight between London and Washington, D.C. Dulles Intl Airport?

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

The month of March is, on average, the cheapest month to fly to Washington, D.C. Dulles Intl Airport from London, with most prices found around £498. If you aren’t able to travel during the month of March, then book flights to Washington, D.C. Dulles Intl Airport from London during November instead. Flights to Washington, D.C. Dulles Intl Airport in November, while not as cheap as those in March, still average around £507.

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

According to our data, Wednesday is the cheapest day to fly to Washington, D.C. Dulles Intl Airport from London. The lowest ticket price found for a Wednesday departure recently was £594. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. On the other hand, Sunday is the most expensive day to depart from London because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £672.

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

The cheapest time of day to fly to Washington, D.C. Dulles Intl Airport is in the evening when flights can be purchased for as low as £523. In contrast, the most expensive time of day to depart to Washington, D.C. Dulles Intl Airport is in the afternoon when prices are around £627.

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

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

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

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around £586 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from London for as low as £538 on momondo.

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

There are 4 cabin classes available to choose from on London to Washington, D.C. Dulles Intl 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. Dulles Intl Airport flights?

You could potentially save up to 1% on your flight if you consider stops on a London to Washington, D.C. Dulles Intl Airport flight.

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

As of September 2025, prices for London to Washington, D.C. Dulles Intl Airport flights are approximately 99% more expensive when compared to flights at the same time last year.

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

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

Cheap London to Washington, D.C. Dulles Intl Airport (LON to IAD) flight deals and tips

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

Best price found

£545

Fastest flight time

8h 10m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from London in the past 72 hours is £545. The best return flight deal from London to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is £482.
The fastest flight from London to Washington, D.C. Dulles Intl Airport takes 8h 10m
Direct flights go from London to Washington, D.C. Dulles Intl Airport every day.
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  • How far is London to Washington, D.C. Dulles Intl by plane?

    There are 3677.3 mi between London and Washington, D.C. Dulles Intl. Typically, this will take 8h 05m by plane in normal conditions.

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

    Prices for flights from London to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Washington, D.C. Dulles Intl Airport.

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

    The travel and health documents required for your trip to Washington, D.C. Dulles Intl 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 Washington, D.C. Dulles Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

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

Best airlines flying from London to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from London to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom £187Free CancellationRating
7.9
7,960 reviews
Search Delta flights
PLAYPriceFrom £243Free CancellationRating
7.0
103 reviews
Search PLAY flights
IcelandairPriceFrom £344Free CancellationRating
7.0
546 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom £350Free CancellationRating
7.1
1,977 reviews
Search TAP AIR PORTUGAL flights
Aer LingusPriceFrom £400Free CancellationRating
7.2
1,271 reviews
Search Aer Lingus flights
United AirlinesPriceFrom £428Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
FinnairPriceFrom £430Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
LufthansaPriceFrom £434Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom £434Free CancellationRating
7.4
1,484 reviews
Search Scandinavian Airlines flights
Air FrancePriceFrom £435Free CancellationRating
7.4
1,469 reviews
Search Air France flights

  • Delta Flights From London to Washington, D.C. Dulles Intl Airport

    The lowest priced Delta flight from London to Washington, D.C. Dulles Intl Airport from the last 72 hours was £253. Generally, Delta has 7 flights on this route every week with an average price of £717. Delta is rated 7.9/10 by our users.

  • KLM Flights From London to Washington, D.C. Dulles Intl Airport

    Across 1,385 KLM reviews on momondo, the average score is 7.8/10. KLM flies from London to Washington, D.C. Dulles Intl Airport about 7 times each week, with ticket deals ranging from £603 to £830. Price data is based on momondo searches in the last 72 hours.

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

Book flights to Washington, D.C. if you plan to visit one of these locations
Winchester
Laurel
Essex
Alexandria
Fairfax
Manassas
Bethesda
Oxon Hill
Gettysburg
Front Royal
Cambridge
Ellicott City
Arlington
Westminster
Ashburn
Woodbridge
Owings Mills
Sterling
Silver Spring
National Harbor

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Washington, D.C. . Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to Washington, D.C. from London with this policy.

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

Once you have performed a search for London to Washington, D.C. flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from London to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

An easier way to manage your Washington, D.C. Dulles Intl Airport trip

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