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Cheap flights from London to Washington, D.C. from $494

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 2/12. 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
11:20 am - 8:35 pmLHR-IAD
14h 15m1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 5:45 pmIAD-LHR
14h 10m1 stop
$544TAP AIR PORTUGAL
Find Deal
Thu, Apr 2 - Thu, Apr 9
TAP AIR PORTUGAL Logo
11:20 am - 8:35 pmLHR-IAD
14h 15m1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 10:55 pmIAD-LHR
19h 20m1 stop
$550TAP AIR PORTUGAL
Find Deal
Wed, Apr 15 - Wed, Apr 29
Multiple Airlines Logo
2:00 pm - 7:50 amLGW-IAD
22h 50m1 stop
Multiple Airlines Logo
9:20 pm - 10:05 amIAD-LGW
31h 45m1 stop
$553Multiple Airlines
Find Deal
Thu, Nov 27 - Fri, Dec 5
Multiple Airlines Logo
2:00 pm - 8:24 pmLGW-IAD
35h 24m1 stop
Multiple Airlines Logo
5:45 am - 6:00 amIAD-LGW
19h 15m2 stops
$555Multiple Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
Virgin Atlantic Logo
4:50 pm - 8:30 pmLHR-IAD
8h 40mnonstop
Virgin Atlantic Logo
10:20 pm - 10:50 amIAD-LHR
7h 30mnonstop
$595Virgin Atlantic
Find Deal
Mon, Dec 15 - Wed, Dec 31
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
$601Virgin Atlantic
Find Deal
Thu, Dec 4 - Thu, Dec 11
Icelandair Logo
11:55 am - 6:30 pmLGW-IAD
11h 35m1 stop
Icelandair Logo
7:40 pm - 10:55 amIAD-LGW
10h 15m1 stop
$602Icelandair
Find Deal
Wed, Dec 10 - Wed, Dec 17
Icelandair Logo
8:35 pm - 6:30 pmLHR-IAD
26h 55m1 stop
Icelandair Logo
7:40 pm - 10:50 amIAD-LHR
10h 10m1 stop
$604Icelandair
Find Deal
Mon, Nov 24 - Mon, Dec 8
Delta Logo
10:00 am - 4:05 pmLCY-IAD
11h 05m1 stop
Delta Logo
5:50 pm - 8:10 amIAD-LCY
9h 20m1 stop
$673Delta
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Mon, Dec 15 - Wed, Sep 16
Delta Logo
7:45 am - 4:05 pmLCY-IAD
13h 20m1 stop
Delta Logo
6:05 pm - 9:30 amIAD-LCY
10h 25m1 stop
$684Delta
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Wed, Dec 10 - Wed, Dec 31

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

Our best Scandinavian Airlines deals on London to Washington, D.C. Dulles Intl Airport flight tickets
Scandinavian Airlines
Feb 2
LHR6:40 amLondon Heathrow
15h 35m
1 stop
IAD5:15 pmWashington, D.C. Dulles Intl
Feb 9
IAD8:30 pmWashington, D.C. Dulles Intl
14h 30m
1 stop
LHR4:00 pmLondon Heathrow
$568
Find similar
Scandinavian Airlines
Feb 18
LHR10:20 amLondon Heathrow
11h 55m
1 stop
IAD5:15 pmWashington, D.C. Dulles Intl
Feb 28
IAD8:30 pmWashington, D.C. Dulles Intl
14h 30m
1 stop
LHR4:00 pmLondon Heathrow
$571
Find similar
Scandinavian Airlines
Jan 10
LHR3:35 pmLondon Heathrow
54h 40m
2 stops
IAD5:15 pmWashington, D.C. Dulles Intl
Jan 24
IAD8:30 pmWashington, D.C. Dulles Intl
14h 30m
1 stop
LHR4:00 pmLondon Heathrow
$572
Find similar

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

Our best Virgin Atlantic deals on London to Washington, D.C. Dulles Intl Airport flight tickets
Virgin Atlantic
Dec 15
LHR4:50 pmLondon Heathrow
8h 40m
IAD8:30 pmWashington, D.C. Dulles Intl
Dec 31
IAD10:20 pmWashington, D.C. Dulles Intl
7h 30m
LHR10:50 amLondon Heathrow
$595
Find similar
Virgin Atlantic
Dec 4
LHR8:40 amLondon Heathrow
12h 25m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
Dec 11
IAD10:20 pmWashington, D.C. Dulles Intl
7h 30m
LHR10:50 amLondon Heathrow
$601
Find similar
Virgin Atlantic
Dec 15
LHR11:45 amLondon Heathrow
28h 54m
2 stops
IAD11:39 amWashington, D.C. Dulles Intl
Dec 31
IAD10:57 amWashington, D.C. Dulles Intl
15h 53m
1 stop
LHR7:50 amLondon Heathrow
$605
Find similar

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated November 4, 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

Thu 4/2

11:20 am-8:35 pm

1 stop14h 15m

Washington, D.C. Dulles Intl

Thu 4/9

10:35 pm-5:45 pm

1 stop14h 10m

$544

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 4/15

11:20 am-8:35 pm

1 stop14h 15m

Washington, D.C. Dulles Intl

Wed 4/29

10:35 pm-10:55 pm

1 stop19h 20m

$550

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 11/27

2:00 pm-7:50 am

1 stop22h 50m

Washington, D.C. Dulles Intl

Fri 12/5

9:20 pm-10:05 am

1 stop31h 45m

$553

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 12/4

2:00 pm-8:24 pm

1 stop35h 24m

Washington, D.C. Dulles Intl

Sun 12/7

5:45 am-6:00 am

2 stops19h 15m

$555

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 12/15

4:50 pm-8:30 pm

Nonstop8h 40m

Washington, D.C. Dulles Intl

Wed 12/31

10:20 pm-10:50 am

Nonstop7h 30m

$595

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 12/4

8:40 am-4:05 pm

1 stop12h 25m

Washington, D.C. Dulles Intl

Thu 12/11

10:20 pm-10:50 am

Nonstop7h 30m

$601

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Wed 12/10

11:55 am-6:30 pm

1 stop11h 35m

Washington, D.C. Dulles Intl

Wed 12/17

7:40 pm-10:55 am

1 stop10h 15m

$602

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 11/24

8:35 pm-6:30 pm

1 stop26h 55m

Washington, D.C. Dulles Intl

Mon 12/8

7:40 pm-10:50 am

1 stop10h 10m

$604

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Mon 12/15

10:00 am-4:05 pm

1 stop11h 05m

Washington, D.C. Dulles Intl

Wed 9/16

5:50 pm-8:10 am

1 stop9h 20m

$673

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Wed 12/10

7:45 am-4:05 pm

1 stop13h 20m

Washington, D.C. Dulles Intl

Wed 12/31

6:05 pm-9:30 am

1 stop10h 25m

$684

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. 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?

In general, September is the cheapest month to fly from London to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $653. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $678.

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

Our data shows that Thursday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $777. 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. Dulles Intl Airport for around $936.

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

Flying to Washington, D.C. Dulles Intl Airport from London in the evening is the least expensive time of day to depart. momondo users have found prices as low as $743 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $867 on average. Flights to Washington, D.C. Dulles Intl Airport from London in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $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. Dulles Intl Airport from London for as low as $737 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?

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

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

As of November 2025, prices for London to Washington, D.C. Dulles Intl Airport flights are approximately 5% 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 round-trip 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

$700

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 $700. The best round-trip flight deal from London to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $767.
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?

    Washington, D.C. Dulles Intl is 3677.3 mi away from London. By plane, this route typically takes 8h 40m.

  • 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?

    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 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 you'll need for your trip to Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport. 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. 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 $320Free CancellationRating
7.9
8,004 reviews
Search Delta flights
Scandinavian AirlinesPriceFrom $390Free CancellationRating
7.4
1,560 reviews
Search Scandinavian Airlines flights
Austrian AirlinesPriceFrom $431Free CancellationRating
7.6
864 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
571 reviews
Search Icelandair flights
American AirlinesPriceFrom $562Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
United AirlinesPriceFrom $567Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights
British AirwaysPriceFrom $594Free CancellationRating
6.7
7,496 reviews
Search British Airways flights
Air CanadaPriceFrom $635Free CancellationRating
7.1
10,404 reviews
Search Air Canada flights
LufthansaPriceFrom $649Free CancellationRating
6.8
7,553 reviews
Search Lufthansa flights

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

    Delta flies from London to Washington, D.C. Dulles Intl Airport around 7 times per week, with 8,004 momondo users rating the airline 7.9/10. The cheapest Delta deal from London to Washington, D.C. Dulles Intl Airport in the last 72 hours was $320 (round-trip), much lower than the average airfare cost of $964 for Delta flights on this route.

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

    Across 864 Austrian Airlines reviews on momondo, the average score is 7.6/10. Austrian Airlines flies from London to Washington, D.C. Dulles Intl Airport about 14 times each week, with ticket deals ranging from $431 to $858. Price data is based on momondo 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
Winchester
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Harpers Ferry
Towson
Rockville
Manassas
Reston
Gaithersburg
Fairfax
Sterling

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. All flights to Washington, D.C. from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo helps you find the best flight between London and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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.

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