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Cheap flights from Washington, D.C. Dulles Intl Airport to London from $250

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to London departing on 11/30. 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 Washington, D.C. Dulles Intl Airport to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
5:30 pm - 9:35 pmIAD-LHR
23h 05m1 stop
TAP AIR PORTUGAL Logo
6:30 pm - 9:00 pmLHR-IAD
31h 30m1 stop
$561TAP AIR PORTUGAL
Find Deal
Tue, Dec 30 - Tue, Jan 13
Aer Lingus Logo
9:00 pm - 1:25 pmIAD-LHR
11h 25m1 stop
Aer Lingus Logo
12:10 pm - 7:30 pmLHR-IAD
12h 20m1 stop
$562Aer Lingus
Find Deal
Tue, Dec 9 - Thu, Dec 18
Icelandair Logo
7:40 pm - 7:30 pmIAD-LHR
18h 50m1 stop
Icelandair Logo
8:35 pm - 6:30 pmLHR-IAD
26h 55m1 stop
$563Icelandair
Find Deal
Wed, Nov 19 - Tue, Dec 2
Virgin Atlantic Logo
10:20 pm - 10:50 amIAD-LHR
7h 30mnonstop
Virgin Atlantic Logo
4:50 pm - 8:30 pmLHR-IAD
8h 40mnonstop
$564Virgin Atlantic
Find Deal
Sun, Nov 9 - Tue, Nov 18
Virgin Atlantic Logo
10:20 pm - 10:50 amIAD-LHR
7h 30mnonstop
Virgin Atlantic Logo
4:50 pm - 8:30 pmLHR-IAD
8h 40mnonstop
$566Virgin Atlantic
Find Deal
Sun, Nov 9 - Tue, Nov 18
British Airways Logo
9:45 pm - 10:00 amIAD-LHR
7h 15mnonstop
British Airways Logo
12:10 pm - 3:35 pmLHR-IAD
8h 25mnonstop
$579British Airways
Find Deal
Tue, Dec 9 - Thu, Dec 18
British Airways Logo
9:45 pm - 10:00 amIAD-LHR
7h 15mnonstop
British Airways Logo
12:10 pm - 3:35 pmLHR-IAD
8h 25mnonstop
$584British Airways
Find Deal
Tue, Dec 2 - Fri, Dec 19
Iberia Logo
6:00 pm - 10:35 amIAD-LHR
11h 35m1 stop
Iberia Logo
12:10 pm - 3:35 pmLHR-IAD
8h 25mnonstop
$600Iberia
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Tue, Jan 27 - Tue, Feb 10
United Airlines Logo
10:15 pm - 10:50 amIAD-LHR
7h 35mnonstop
United Airlines Logo
11:10 am - 8:05 pmLHR-IAD
13h 55m1 stop
$603United Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
United Airlines Logo
6:20 pm - 6:40 amIAD-LHR
7h 20mnonstop
United Airlines Logo
6:35 am - 3:35 pmLHR-IAD
14h 00m1 stop
$604United Airlines
Find Deal
Tue, Nov 4 - Tue, Nov 18

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

Our best TAP AIR PORTUGAL deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
TAP AIR PORTUGAL
Dec 30
IAD5:30 pmWashington, D.C. Dulles Intl
23h 05m
1 stop
LHR9:35 pmLondon Heathrow
Jan 13
LHR6:30 pmLondon Heathrow
31h 30m
1 stop
IAD9:00 pmWashington, D.C. Dulles Intl
$561
Find similar
TAP AIR PORTUGAL
Dec 11
IAD5:30 pmWashington, D.C. Dulles Intl
12h 55m
1 stop
LHR11:25 amLondon Heathrow
Dec 16
LHR6:00 amLondon Heathrow
13h 35m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$567
Find similar

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

Our best Icelandair deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
Icelandair
Nov 10
IAD7:40 pmWashington, D.C. Dulles Intl
10h 10m
1 stop
LHR10:50 amLondon Heathrow
Nov 17
LHR8:35 pmLondon Heathrow
26h 55m
1 stop
IAD6:30 pmWashington, D.C. Dulles Intl
$562
Find similar
Icelandair
Nov 19
IAD7:40 pmWashington, D.C. Dulles Intl
18h 50m
1 stop
LHR7:30 pmLondon Heathrow
Dec 2
LHR8:35 pmLondon Heathrow
26h 55m
1 stop
IAD6:30 pmWashington, D.C. Dulles Intl
$563
Find similar
Icelandair
Dec 5
IAD7:40 pmWashington, D.C. Dulles Intl
10h 10m
1 stop
LHR10:50 amLondon Heathrow
Dec 15
LHR12:15 pmLondon Heathrow
11h 15m
1 stop
IAD6:30 pmWashington, D.C. Dulles Intl
$565
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to London Heathrow 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 October 31, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/30

5:30 pm-9:35 pm

1 stop23h 05m

London Heathrow

Tue 1/13

6:30 pm-9:00 pm

1 stop31h 30m

$561

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/9

9:00 pm-1:25 pm

1 stop11h 25m

London Heathrow

Thu 12/18

12:10 pm-7:30 pm

1 stop12h 20m

$562

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 11/19

7:40 pm-7:30 pm

1 stop18h 50m

London Heathrow

Tue 12/2

8:35 pm-6:30 pm

1 stop26h 55m

$563

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 11/9

10:20 pm-10:50 am

Nonstop7h 30m

London Heathrow

Tue 11/18

4:50 pm-8:30 pm

Nonstop8h 40m

$564

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 11/9

10:20 pm-10:50 am

Nonstop7h 30m

London Heathrow

Tue 11/18

4:50 pm-8:30 pm

Nonstop8h 40m

$566

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/9

9:45 pm-10:00 am

Nonstop7h 15m

London Heathrow

Thu 12/18

12:10 pm-3:35 pm

Nonstop8h 25m

$579

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/2

9:45 pm-10:00 am

Nonstop7h 15m

London Heathrow

Fri 12/19

12:10 pm-3:35 pm

Nonstop8h 25m

$584

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 1/27

6:00 pm-10:35 am

1 stop11h 35m

London Heathrow

Tue 2/10

12:10 pm-3:35 pm

Nonstop8h 25m

$600

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 12/4

10:15 pm-10:50 am

Nonstop7h 35m

London Heathrow

Sun 12/7

11:10 am-8:05 pm

1 stop13h 55m

$603

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 11/4

6:20 pm-6:40 am

Nonstop7h 20m

London Heathrow

Tue 11/18

6:35 am-3:35 pm

1 stop14h 00m

$604

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 London from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to London Heathrow 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 London Heathrow Airport?

The month of August is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, with most prices found around $671. If you’re not able to fly to London Heathrow Airport in August, then September is your next best option. Flight prices from Washington, D.C. Dulles Intl Airport to London Heathrow Airport during September average around $677.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $766. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $906.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the evening for as low as $818. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $823.

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

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

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $759 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport for as low as $705 on momondo.

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

There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

As of October 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 8% more expensive when compared to flights at the same time last year.

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

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

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

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

Best Price Found

$421

Fastest flight time

7h 10m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Washington, D.C. Dulles Intl Airport in the past 72 hours is $421. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo in the last 72 hours is $704.
The fastest flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport takes 7h 10m
Direct flights go from Washington, D.C. Dulles Intl Airport to London Heathrow Airport every day.
Search flight deals

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

    A flight from Washington, D.C. Dulles Intl to London Heathrow will travel around 3664.4 mi. By plane, this route typically takes 7h 10m.

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

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

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

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

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents you'll need for your trip to London Heathrow 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 London Heathrow 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

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

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

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
PLAYPriceFrom $372Free CancellationRating
7.0
103 reviews
Search PLAY flights
TAP AIR PORTUGALPriceFrom $395Free CancellationRating
7.1
2,041 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $397Free CancellationRating
6.8
7,543 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom $424Free CancellationRating
7.4
1,550 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $433Free CancellationRating
7.1
563 reviews
Search Icelandair flights
British AirwaysPriceFrom $547Free CancellationRating
6.7
7,489 reviews
Search British Airways flights
Air CanadaPriceFrom $549Free CancellationRating
7.1
10,387 reviews
Search Air Canada flights
DeltaPriceFrom $561Free CancellationRating
7.9
7,996 reviews
Search Delta flights
United AirlinesPriceFrom $562Free CancellationRating
7.4
8,995 reviews
Search United Airlines flights
Virgin AtlanticPriceFrom $562Free CancellationRating
7.5
671 reviews
Search Virgin Atlantic flights

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

    The lowest priced Delta flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from the last 72 hours was $561. Generally, Delta has 4 flights on this route every week with an average price of $828. Delta is rated 7.9/10 by our users.

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

    $600 is the best Finnair flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average Finnair ticket price found was closer to $751, however, with flight time and availability significantly affecting the price. Finnair (7.6/10 from 1,333 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 7 times in an average week so prices can vary.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Stratford-upon-Avon
Brentwood
Salisbury
Chelmsford
Folkestone
Romford
Ilford
Swindon
Cobham
Wembley

Why use momondo?

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

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 London from Washington, D.C..

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

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

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

Once you have performed a search for Washington, D.C. to London 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 Washington, D.C. to London right now. Can momondo alert me if prices change?

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

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