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Cheap flights from London Heathrow Airport to Washington, D.C. from $357

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 Heathrow Airport to Washington, D.C. departing on 9/2. 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 London Heathrow Airport to Washington, D.C.

Cheap round-trip flights

TAP AIR PORTUGAL Logo
8:00 am - 8:50 pmLHR-IAD
17h 50m1 stop
TAP AIR PORTUGAL Logo
6:30 pm - 12:40 pmIAD-LHR
14h 10m1 stop
$485TAP AIR PORTUGAL
Find Deal
Thu, Oct 23 - Mon, Oct 27
Icelandair Logo
12:15 pm - 6:20 pmLHR-IAD
11h 05m1 stop
Icelandair Logo
7:40 pm - 7:30 pmIAD-LHR
18h 50m1 stop
$489Icelandair
Find Deal
Thu, Nov 6 - Mon, Nov 10
United Airlines Logo
5:40 pm - 1:38 pmLHR-IAD
24h 58m2 stops
United Airlines Logo
10:15 pm - 4:40 pmIAD-LHR
13h 25m1 stop
$491United Airlines
Find Deal
Sat, Sep 27 - Sun, Sep 28
Icelandair Logo
12:15 pm - 6:20 pmLHR-IAD
11h 05m1 stop
Icelandair Logo
7:40 pm - 7:30 pmIAD-LHR
18h 50m1 stop
$502Icelandair
Find Deal
Fri, Nov 7 - Mon, Nov 10
TAP AIR PORTUGAL Logo
6:00 am - 3:20 pmLHR-IAD
14h 20m1 stop
TAP AIR PORTUGAL Logo
5:45 pm - 10:20 amIAD-LHR
11h 35m1 stop
$507TAP AIR PORTUGAL
Find Deal
Wed, Oct 15 - Sun, Oct 19
United Airlines Logo
2:05 pm - 7:32 amLHR-IAD
22h 27m2 stops
United Airlines Logo
6:40 pm - 6:55 amIAD-LHR
7h 15mnonstop
$514United Airlines
Find Deal
Sat, Sep 27 - Sun, Sep 28
Lufthansa Logo
10:50 am - 7:25 pmLHR-IAD
13h 35m1 stop
Lufthansa Logo
10:32 pm - 8:40 pmIAD-LHR
17h 08m1 stop
$524Lufthansa
Find Deal
Sat, Sep 13 - Sat, Sep 13
Lufthansa Logo
6:30 am - 1:30 pmLHR-IAD
12h 00m1 stop
Lufthansa Logo
10:32 pm - 8:40 pmIAD-LHR
17h 08m1 stop
$536Lufthansa
Find Deal
Sat, Sep 20 - Sat, Sep 20
Scandinavian Airlines Logo
7:50 pm - 6:50 pmLHR-IAD
28h 00m2 stops
Scandinavian Airlines Logo
8:30 pm - 9:40 pmIAD-LHR
20h 10m1 stop
$566Scandinavian Airlines
Find Deal
Fri, Nov 7 - Mon, Nov 10
Scandinavian Airlines Logo
7:30 pm - 7:59 pmLHR-IAD
29h 29m1 stop
Scandinavian Airlines Logo
10:05 pm - 2:35 pmIAD-LHR
35h 30m2 stops
$567Scandinavian Airlines
Find Deal
Wed, Sep 17 - Wed, Oct 15

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

Our best Icelandair deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets
Icelandair
Nov 6
LHR12:15 pmLondon Heathrow
11h 05m
1 stop
IAD6:20 pmWashington, D.C. Dulles Intl
Nov 10
IAD7:40 pmWashington, D.C. Dulles Intl
18h 50m
1 stop
LHR7:30 pmLondon Heathrow
$489
Find similar
Icelandair
Nov 7
LHR12:15 pmLondon Heathrow
11h 05m
1 stop
IAD6:20 pmWashington, D.C. Dulles Intl
Nov 10
IAD7:40 pmWashington, D.C. Dulles Intl
18h 50m
1 stop
LHR7:30 pmLondon Heathrow
$502
Find similar
Icelandair
Sep 21
LHR9:25 pmLondon Heathrow
26h 55m
1 stop
IAD7:20 pmWashington, D.C. Dulles Intl
Oct 2
IAD8:30 pmWashington, D.C. Dulles Intl
18h 50m
1 stop
LHR8:20 pmLondon Heathrow
$526
Find similar

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

Our best Lufthansa deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets
Lufthansa
Sep 13
LHR10:50 amLondon Heathrow
13h 35m
1 stop
IAD7:25 pmWashington, D.C. Dulles Intl
Sep 13
IAD10:32 pmWashington, D.C. Dulles Intl
17h 08m
1 stop
LHR8:40 pmLondon Heathrow
$524
Find similar
Lufthansa
Sep 20
LHR6:30 amLondon Heathrow
12h 00m
1 stop
IAD1:30 pmWashington, D.C. Dulles Intl
Sep 20
IAD10:32 pmWashington, D.C. Dulles Intl
17h 08m
1 stop
LHR8:40 pmLondon Heathrow
$536
Find similar
Lufthansa
Aug 8
LHR7:30 amLondon Heathrow
12h 45m
1 stop
IAD3:15 pmWashington, D.C. Dulles Intl
Aug 14
IAD6:35 pmWashington, D.C. Dulles Intl
7h 20m
LHR6:55 amLondon Heathrow
$697
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport 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 July 31, 2025.
Use the filters below to find and compare flights from London Heathrow Airport 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 10/23

8:00 am-8:50 pm

1 stop17h 50m

Washington, D.C. Dulles Intl

Mon 10/27

6:30 pm-12:40 pm

1 stop14h 10m

$485

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 11/6

12:15 pm-6:20 pm

1 stop11h 05m

Washington, D.C. Dulles Intl

Mon 11/10

7:40 pm-7:30 pm

1 stop18h 50m

$489

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 9/27

5:40 pm-1:38 pm

2 stops24h 58m

Washington, D.C. Dulles Intl

Sun 9/28

10:15 pm-4:40 pm

1 stop13h 25m

$491

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 11/7

12:15 pm-6:20 pm

1 stop11h 05m

Washington, D.C. Dulles Intl

Mon 11/10

7:40 pm-7:30 pm

1 stop18h 50m

$502

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 10/15

6:00 am-3:20 pm

1 stop14h 20m

Washington, D.C. Dulles Intl

Sun 10/19

5:45 pm-10:20 am

1 stop11h 35m

$507

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 9/27

2:05 pm-7:32 am

2 stops22h 27m

Washington, D.C. Dulles Intl

Sun 9/28

6:40 pm-6:55 am

Nonstop7h 15m

$514

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 9/13

10:50 am-7:25 pm

1 stop13h 35m

Washington, D.C. Dulles Intl

Sat 9/13

10:32 pm-8:40 pm

1 stop17h 08m

$524

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 9/20

6:30 am-1:30 pm

1 stop12h 00m

Washington, D.C. Dulles Intl

Sat 9/20

10:32 pm-8:40 pm

1 stop17h 08m

$536

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 11/7

7:50 pm-6:50 pm

2 stops28h 00m

Washington, D.C. Dulles Intl

Mon 11/10

8:30 pm-9:40 pm

1 stop20h 10m

$566

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 9/17

7:30 pm-7:59 pm

1 stop29h 29m

Washington, D.C. Dulles Intl

Wed 10/15

10:05 pm-2:35 pm

2 stops35h 30m

$567

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 Heathrow Airport 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 cheapest month to fly to Washington, D.C. Dulles Intl Airport?

In general, February is the cheapest month to fly from London Heathrow Airport 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 $685. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $702.

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 $826. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Washington, D.C. Dulles Intl Airport for around $939.

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 Heathrow Airport 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 $880 on average. Flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

Fly from London Heathrow to Washington, D.C. Dulles Intl for the best London Heathrow - 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 Heathrow Airport 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 $811 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 Heathrow Airport for as low as $730 on momondo.

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

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

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

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

As of July 2025, prices for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights are approximately 59% more expensive when compared to flights at the same time last year.

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

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

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

Best Price Found

$357

Fastest flight time

8h 15m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from London Heathrow Airport in the past 72 hours is $357. The best round-trip flight deal from London Heathrow Airport to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $485.
The fastest flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport takes 8h 15m
Direct flights go from London Heathrow Airport to Washington, D.C. Dulles Intl Airport every day.
Search flight deals

  • How far is London Heathrow to Washington, D.C. Dulles Intl by plane?

    The distance between London Heathrow and Washington, D.C. Dulles Intl is about 3664.4 mi. In terms of flight time, this usually takes a little over 8h 15m.

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

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

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

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

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

    The required travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C. Dulles Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

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

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

Compare and see reviews for airlines that fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Scandinavian AirlinesPriceFrom $390Free CancellationRating
7.3
1,457 reviews
Search Scandinavian Airlines flights
PLAYPriceFrom $392Free CancellationRating
7.0
102 reviews
Search PLAY flights
Austrian AirlinesPriceFrom $431Free CancellationRating
7.6
823 reviews
Search Austrian Airlines flights
TAP AIR PORTUGALPriceFrom $476Free CancellationRating
7.1
1,933 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom $510Free CancellationRating
7.0
520 reviews
Search Icelandair flights
British AirwaysPriceFrom $595Free CancellationRating
6.6
7,222 reviews
Search British Airways flights
American AirlinesPriceFrom $619Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Aer LingusPriceFrom $652Free CancellationRating
7.1
1,192 reviews
Search Aer Lingus flights
DeltaPriceFrom $652Free CancellationRating
8.0
7,981 reviews
Search Delta flights
United AirlinesPriceFrom $663Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights

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

    Delta operates around 6 flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport every week. The average price of these flights found in the last 72 hours has been $996, but momondo users have found Delta deals from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from as low as $652 round-trip. Delta has been scored 8.0/10 in 7,981 reviews.

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

    Austrian Airlines is also a popular choice for this route. Austrian Airlines flight deals for London Heathrow Airport to Washington, D.C. Dulles Intl Airport start from as low as $431 round-trip, depending on your selected dates, with average Austrian Airlines deals seen on momondo around $984. Austrian Airlines operates 14 flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport in an average week. Users have rated it 7.6/10 across 823 reviews.

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

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

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?

All flight searches from London to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

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

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