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Cheap flights from London to Washington, D.C. from £203

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 10/9. 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

United Airlines Logo
14:05 - 07:32LHR-IAD
22h 27m2 stops
United Airlines Logo
09:35 - 06:30IAD-LHR
15h 55m1 stop
£359United Airlines
Find Deal
Sat, 27 Sep - Sun, 28 Sep
TAP AIR PORTUGAL Logo
10:35 - 20:50LGW-IAD
15h 15m1 stop
TAP AIR PORTUGAL Logo
18:30 - 15:45IAD-LGW
17h 15m1 stop
£361TAP AIR PORTUGAL
Find Deal
Thu, 23 Oct - Mon, 27 Oct
Icelandair Logo
11:55 - 18:20LGW-IAD
11h 25m1 stop
Icelandair Logo
19:40 - 10:55IAD-LGW
10h 15m1 stop
£364Icelandair
Find Deal
Thu, 6 Nov - Mon, 10 Nov
Icelandair Logo
12:15 - 18:20LHR-IAD
11h 05m1 stop
Icelandair Logo
19:40 - 19:30IAD-LHR
18h 50m1 stop
£367Icelandair
Find Deal
Thu, 6 Nov - Mon, 10 Nov
Lufthansa Logo
07:25 - 15:05LHR-IAD
12h 40m1 stop
Lufthansa Logo
22:32 - 20:40IAD-LHR
17h 08m1 stop
£371Lufthansa
Find Deal
Sat, 13 Sep - Sat, 13 Sep
Lufthansa Logo
10:50 - 19:25LHR-IAD
13h 35m1 stop
Lufthansa Logo
22:32 - 20:40IAD-LHR
17h 08m1 stop
£393Lufthansa
Find Deal
Sat, 13 Sep - Sat, 13 Sep
Virgin Atlantic Logo
09:20 - 15:35LCY-IAD
11h 15m1 stop
Virgin Atlantic Logo
17:25 - 09:30IAD-LCY
11h 05m1 stop
£506Virgin Atlantic
Find Deal
Fri, 12 Sep - Fri, 19 Sep
Virgin Atlantic Logo
09:20 - 15:35LCY-IAD
11h 15m1 stop
Virgin Atlantic Logo
20:17 - 16:40IAD-LCY
15h 23m2 stops
£510Virgin Atlantic
Find Deal
Fri, 5 Sep - Mon, 15 Sep
KLM Logo
10:00 - 15:35LCY-IAD
10h 35m1 stop
KLM Logo
17:25 - 08:10IAD-LCY
9h 45m1 stop
£528KLM
Find Deal
Thu, 11 Sep - Thu, 18 Sep
KLM Logo
10:00 - 15:35LCY-IAD
10h 35m1 stop
KLM Logo
17:25 - 08:10IAD-LCY
9h 45m1 stop
£529KLM
Find Deal
Wed, 10 Sep - Wed, 17 Sep

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

Our best Icelandair deals on London to Washington, D.C. Dulles Intl Airport flight tickets
Icelandair
6 Nov
LGW11:55London Gatwick
11h 25m
1 stop
IAD18:20Washington, D.C. Dulles Intl
10 Nov
IAD19:40Washington, D.C. Dulles Intl
10h 15m
1 stop
LGW10:55London Gatwick
£364
Find similar
Icelandair
6 Nov
LHR12:15London Heathrow
11h 05m
1 stop
IAD18:20Washington, D.C. Dulles Intl
10 Nov
IAD19:40Washington, D.C. Dulles Intl
18h 50m
1 stop
LHR19:30London Heathrow
£367
Find similar
Icelandair
8 Nov
LGW11:55London Gatwick
11h 25m
1 stop
IAD18:20Washington, D.C. Dulles Intl
14 Nov
IAD19:40Washington, D.C. Dulles Intl
10h 15m
1 stop
LGW10:55London Gatwick
£369
Find similar

TAP AIR PORTUGAL flights from London to Washington, D.C. Dulles Intl Airport

Our best TAP AIR PORTUGAL deals on London to Washington, D.C. Dulles Intl Airport flight tickets
TAP AIR PORTUGAL
23 Oct
LGW10:35London Gatwick
15h 15m
1 stop
IAD20:50Washington, D.C. Dulles Intl
27 Oct
IAD18:30Washington, D.C. Dulles Intl
17h 15m
1 stop
LGW15:45London Gatwick
£361
Find similar
TAP AIR PORTUGAL
23 Oct
LHR08:00London Heathrow
12h 20m
1 stop
IAD15:20Washington, D.C. Dulles Intl
27 Oct
IAD18:30Washington, D.C. Dulles Intl
14h 10m
1 stop
LHR12:40London Heathrow
£364
Find similar
TAP AIR PORTUGAL
15 Oct
LHR19:50London Heathrow
24h 30m
1 stop
IAD15:20Washington, D.C. Dulles Intl
19 Oct
IAD22:20Washington, D.C. Dulles Intl
18h 40m
1 stop
LHR22:00London Heathrow
£382
Find similar

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 31 July 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

Sat 27/9

14:05-07:32

2 stops22h 27m

Washington, D.C. Dulles Intl

Sun 28/9

09:35-06:30

1 stop15h 55m

£359

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 23/10

10:35-20:50

1 stop15h 15m

Washington, D.C. Dulles Intl

Mon 27/10

18:30-15:45

1 stop17h 15m

£361

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 6/11

11:55-18:20

1 stop11h 25m

Washington, D.C. Dulles Intl

Mon 10/11

19:40-10:55

1 stop10h 15m

£364

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 6/11

12:15-18:20

1 stop11h 05m

Washington, D.C. Dulles Intl

Mon 10/11

19:40-19:30

1 stop18h 50m

£367

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 13/9

07:25-15:05

1 stop12h 40m

Washington, D.C. Dulles Intl

Sat 13/9

22:32-20:40

1 stop17h 08m

£371

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 13/9

10:50-19:25

1 stop13h 35m

Washington, D.C. Dulles Intl

Sat 13/9

22:32-20:40

1 stop17h 08m

£393

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Fri 12/9

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Fri 19/9

17:25-09:30

1 stop11h 05m

£506

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Fri 5/9

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Mon 15/9

20:17-16:40

2 stops15h 23m

£510

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Thu 11/9

10:00-15:35

1 stop10h 35m

Washington, D.C. Dulles Intl

Thu 18/9

17:25-08:10

1 stop9h 45m

£528

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Wed 10/9

10:00-15:35

1 stop10h 35m

Washington, D.C. Dulles Intl

Wed 17/9

17:25-08:10

1 stop9h 45m

£529

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 £508. 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 £520.

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 £615. 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 £690.

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 £532. 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 £645.

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 £609 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 £548 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.

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

As of July 2025, prices for London to Washington, D.C. Dulles Intl Airport flights are approximately 36% 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

£203

Fastest flight time

8h 15m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from London in the past 72 hours is £203. The best return flight deal from London to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is £359.
The fastest flight from London to Washington, D.C. Dulles Intl Airport takes 8h 15m
Direct flights go from London to Washington, D.C. Dulles Intl Airport every day.
Search flight deals

  • 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 15m 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 £190Free CancellationRating
8.0
7,980 reviews
Search Delta flights
PLAYPriceFrom £251Free CancellationRating
7.0
102 reviews
Search PLAY flights
IcelandairPriceFrom £350Free CancellationRating
7.0
519 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom £356Free CancellationRating
7.1
1,930 reviews
Search TAP AIR PORTUGAL flights
FinnairPriceFrom £442Free CancellationRating
7.6
1,316 reviews
Search Finnair flights
Scandinavian AirlinesPriceFrom £442Free CancellationRating
7.3
1,453 reviews
Search Scandinavian Airlines flights
Air FrancePriceFrom £442Free CancellationRating
7.5
1,465 reviews
Search Air France flights
LufthansaPriceFrom £446Free CancellationRating
6.8
7,269 reviews
Search Lufthansa flights
United AirlinesPriceFrom £450Free CancellationRating
7.4
8,896 reviews
Search United Airlines flights
Virgin AtlanticPriceFrom £459Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic 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 6 flights on this route every week with an average price of £717. Delta is rated 8.0/10 by our users.

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

    Across 1,383 KLM reviews on momondo, the average score is 7.8/10. KLM flies from London to Washington, D.C. Dulles Intl Airport about 6 times each week, with ticket deals ranging from £629 to £841. 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
Chantilly
College Park
Linthicum Heights
Gettysburg
Front Royal
Hanover
Cambridge
Ellicott City
Westminster
Arlington
Ashburn
Woodbridge

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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