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Cheap flights from London Heathrow Airport to Washington, D.C. from $506

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 9/20. 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

SWISS Logo
8:05 pm - 3:35 pmLHR-IAD
23h 30m1 stop
SWISS Logo
8:30 pm - 1:00 pmIAD-LHR
11h 30m1 stop
$535SWISS
Find Deal
Mon, Oct 27 - Fri, Nov 7
United Airlines Logo
11:10 am - 9:05 pmLHR-IAD
13h 55m1 stop
United Airlines Logo
6:00 am - 9:20 pmIAD-LHR
10h 20m1 stop
$536United Airlines
Find Deal
Wed, Oct 29 - Thu, Nov 6
United Airlines Logo
9:30 am - 3:50 pmLHR-IAD
11h 20m1 stop
United Airlines Logo
6:40 pm - 6:55 amIAD-LHR
7h 15mnonstop
$538United Airlines
Find Deal
Thu, Oct 2 - Tue, Oct 7
United Airlines Logo
8:30 am - 4:50 pmLHR-IAD
12h 20m1 stop
United Airlines Logo
8:45 am - 7:10 amIAD-LHR
17h 25m2 stops
$539United Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
British Airways Logo
4:25 pm - 7:55 pmLHR-IAD
8h 30mnonstop
British Airways Logo
6:20 pm - 6:30 amIAD-LHR
7h 10mnonstop
$543British Airways
Find Deal
Fri, Nov 21 - Thu, Dec 11
Virgin Atlantic Logo
12:35 pm - 4:00 pmLHR-IAD
8h 25mnonstop
Virgin Atlantic Logo
5:50 pm - 6:20 amIAD-LHR
7h 30mnonstop
$544Virgin Atlantic
Find Deal
Wed, Oct 1 - Wed, Oct 8
Virgin Atlantic Logo
6:30 am - 11:39 pmLHR-IAD
21h 09m2 stops
Virgin Atlantic Logo
5:03 pm - 8:45 amIAD-LHR
10h 42m1 stop
$550Virgin Atlantic
Find Deal
Thu, Oct 30 - Wed, Nov 12
British Airways Logo
2:30 pm - 5:35 pmLHR-IAD
8h 05mnonstop
British Airways Logo
5:50 pm - 6:15 amIAD-LHR
7h 25mnonstop
$556British Airways
Find Deal
Tue, Sep 30 - Thu, Apr 30
Lufthansa Logo
11:10 am - 9:15 pmLHR-IAD
14h 05m2 stops
Lufthansa Logo
5:40 pm - 10:25 amIAD-LHR
11h 45m1 stop
$567Lufthansa
Find Deal
Tue, Oct 28 - Mon, Nov 3
Delta Logo
10:00 am - 4:05 pmLHR-IAD
11h 05m1 stop
Delta Logo
10:20 pm - 10:50 amIAD-LHR
7h 30mnonstop
$574Delta
Find Deal
Wed, Dec 10 - Wed, Dec 17

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

Our best United Airlines deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets
United Airlines
Sep 22
LHR6:50 amLondon Heathrow
11h 40m
1 stop
IAD1:30 pmWashington, D.C. Dulles Intl
Sep 28
IAD6:40 pmWashington, D.C. Dulles Intl
7h 15m
LHR6:55 amLondon Heathrow
$535
Find similar
United Airlines
Oct 29
LHR11:10 amLondon Heathrow
13h 55m
1 stop
IAD9:05 pmWashington, D.C. Dulles Intl
Nov 6
IAD6:00 amWashington, D.C. Dulles Intl
10h 20m
1 stop
LHR9:20 pmLondon Heathrow
$536
Find similar
United Airlines
Oct 2
LHR9:30 amLondon Heathrow
11h 20m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl
Oct 7
IAD6:40 pmWashington, D.C. Dulles Intl
7h 15m
LHR6:55 amLondon Heathrow
$538
Find similar

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

Our best SWISS deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets
SWISS
Oct 27
LHR8:05 pmLondon Heathrow
23h 30m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Nov 7
IAD8:30 pmWashington, D.C. Dulles Intl
11h 30m
1 stop
LHR1:00 pmLondon Heathrow
$535
Find similar
SWISS
Mar 7
LHR6:00 amLondon Heathrow
14h 30m
1 stop
IAD3:30 pmWashington, D.C. Dulles Intl
Mar 14
IAD7:20 pmWashington, D.C. Dulles Intl
7h 20m
LHR6:40 amLondon Heathrow
$555
Find similar
SWISS
Sep 27
LHR7:00 amLondon Heathrow
12h 20m
1 stop
IAD2:20 pmWashington, D.C. Dulles Intl
Oct 3
IAD8:45 pmWashington, D.C. Dulles Intl
14h 50m
2 stops
LHR4:35 pmLondon Heathrow
$600
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 September 15, 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

Mon 10/27

8:05 pm-3:35 pm

1 stop23h 30m

Washington, D.C. Dulles Intl

Fri 11/7

8:30 pm-1:00 pm

1 stop11h 30m

$535

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 10/29

11:10 am-9:05 pm

1 stop13h 55m

Washington, D.C. Dulles Intl

Thu 11/6

6:00 am-9:20 pm

1 stop10h 20m

$536

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 10/2

9:30 am-3:50 pm

1 stop11h 20m

Washington, D.C. Dulles Intl

Tue 10/7

6:40 pm-6:55 am

Nonstop7h 15m

$538

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 10/29

8:30 am-4:50 pm

1 stop12h 20m

Washington, D.C. Dulles Intl

Wed 11/5

8:45 am-7:10 am

2 stops17h 25m

$539

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 11/21

4:25 pm-7:55 pm

Nonstop8h 30m

Washington, D.C. Dulles Intl

Thu 12/11

6:20 pm-6:30 am

Nonstop7h 10m

$543

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 10/1

12:35 pm-4:00 pm

Nonstop8h 25m

Washington, D.C. Dulles Intl

Wed 10/8

5:50 pm-6:20 am

Nonstop7h 30m

$544

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 10/30

6:30 am-11:39 pm

2 stops21h 09m

Washington, D.C. Dulles Intl

Wed 11/12

5:03 pm-8:45 am

1 stop10h 42m

$550

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 9/30

2:30 pm-5:35 pm

Nonstop8h 05m

Washington, D.C. Dulles Intl

Thu 4/30

5:50 pm-6:15 am

Nonstop7h 25m

$556

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 10/28

11:10 am-9:15 pm

2 stops14h 05m

Washington, D.C. Dulles Intl

Mon 11/3

5:40 pm-10:25 am

1 stop11h 45m

$567

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 12/10

10:00 am-4:05 pm

1 stop11h 05m

Washington, D.C. Dulles Intl

Wed 12/17

10:20 pm-10:50 am

Nonstop7h 30m

$574

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, September 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 $663. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $684.

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 $805. When flying out on a Sunday, 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 $938.

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 at noon when prices are $867 on average. Flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport at noon 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 $782 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 $731 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 September 2025, prices for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights are approximately 29% 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

$685

Fastest flight time

8h 05m

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 $685. 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 $653.
The fastest flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport takes 8h 05m
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 05m.

  • 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
DeltaPriceFrom $320Free CancellationRating
7.9
7,954 reviews
Search Delta flights
Scandinavian AirlinesPriceFrom $390Free CancellationRating
7.4
1,484 reviews
Search Scandinavian Airlines flights
Austrian AirlinesPriceFrom $431Free CancellationRating
7.6
850 reviews
Search Austrian Airlines flights
TAP AIR PORTUGALPriceFrom $473Free CancellationRating
7.1
1,975 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom $490Free CancellationRating
7.0
544 reviews
Search Icelandair flights
American AirlinesPriceFrom $562Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $567Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
British AirwaysPriceFrom $595Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
Air CanadaPriceFrom $635Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
Aer LingusPriceFrom $649Free CancellationRating
7.2
1,270 reviews
Search Aer Lingus 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 $926, but momondo users have found Delta deals from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from as low as $320 round-trip. Delta has been scored 7.9/10 in 7,954 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 850 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
National Harbor
Arlington
Winchester
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Harpers Ferry
Towson
Rockville
Manassas
Reston
Fairfax
Glen Burnie
Gaithersburg

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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