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Cheap flights from Washington, D.C. Dulles Intl Airport to London from $266

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 9/25. 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 (IAD-LHR)

Cheap round-trip flights

Scandinavian Airlines Logo
10:05 pm - 4:00 pmIAD-LHR
12h 55m1 stop
Scandinavian Airlines Logo
6:40 am - 6:50 pmLHR-IAD
17h 10m1 stop
$495Scandinavian Airlines
Find Deal
ศ., ต.ค. 24 - ส., พ.ย. 8
Scandinavian Airlines Logo
10:05 pm - 6:30 pmIAD-LHR
15h 25m1 stop
Scandinavian Airlines Logo
6:40 pm - 6:15 pmLHR-IAD
27h 35m1 stop
$496Scandinavian Airlines
Find Deal
พฤ., ต.ค. 23 - อา., ต.ค. 26
Scandinavian Airlines Logo
10:05 pm - 4:25 pmIAD-LHR
13h 20m2 stops
Scandinavian Airlines Logo
6:40 am - 7:59 pmLHR-IAD
18h 19m1 stop
$497Scandinavian Airlines
Find Deal
พ., ต.ค. 15 - พฤ., ต.ค. 23
Scandinavian Airlines Logo
10:05 pm - 9:35 amIAD-LHR
30h 30m2 stops
Scandinavian Airlines Logo
6:40 pm - 7:59 pmLHR-IAD
30h 19m1 stop
$499Scandinavian Airlines
Find Deal
พฤ., ต.ค. 9 - พ., ต.ค. 15
TAP AIR PORTUGAL Logo
5:50 pm - 5:45 pmIAD-LHR
18h 55m1 stop
TAP AIR PORTUGAL Logo
7:50 pm - 3:20 pmLHR-IAD
24h 30m1 stop
$510TAP AIR PORTUGAL
Find Deal
พ., ต.ค. 8 - พ., ต.ค. 15
TAP AIR PORTUGAL Logo
5:30 pm - 9:35 pmIAD-LHR
23h 05m1 stop
TAP AIR PORTUGAL Logo
6:30 pm - 2:35 pmLHR-IAD
25h 05m1 stop
$511TAP AIR PORTUGAL
Find Deal
อ., ธ.ค. 9 - จ., ธ.ค. 15
TAP AIR PORTUGAL Logo
5:45 pm - 6:50 pmIAD-LHR
20h 05m1 stop
TAP AIR PORTUGAL Logo
6:30 pm - 2:35 pmLHR-IAD
25h 05m1 stop
$539TAP AIR PORTUGAL
Find Deal
จ., ก.ย. 15 - จ., พ.ย. 10
Icelandair Logo
8:30 pm - 8:20 pmIAD-LHR
18h 50m1 stop
Icelandair Logo
9:25 pm - 7:20 pmLHR-IAD
26h 55m1 stop
$549Icelandair
Find Deal
อ., ก.ย. 30 - อ., ต.ค. 14
Icelandair Logo
8:30 pm - 11:55 amIAD-LHR
10h 25m1 stop
Icelandair Logo
9:25 pm - 7:20 pmLHR-IAD
26h 55m1 stop
$551Icelandair
Find Deal
อา., ก.ย. 21 - อ., ก.ย. 30
Icelandair Logo
8:30 pm - 11:55 amIAD-LHR
10h 25m1 stop
Icelandair Logo
9:25 pm - 7:20 pmLHR-IAD
26h 55m1 stop
$554Icelandair
Find Deal
อา., ก.ย. 21 - อ., ก.ย. 30

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

Our best Scandinavian Airlines deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
Scandinavian Airlines
Oct 24
IAD10:05 pmWashington, D.C. Dulles Intl
12h 55m
1 stop
LHR4:00 pmLondon Heathrow
Nov 8
LHR6:40 amLondon Heathrow
17h 10m
1 stop
IAD6:50 pmWashington, D.C. Dulles Intl
$495
Find similar
Scandinavian Airlines
Oct 23
IAD10:05 pmWashington, D.C. Dulles Intl
15h 25m
1 stop
LHR6:30 pmLondon Heathrow
Oct 26
LHR6:40 pmLondon Heathrow
27h 35m
1 stop
IAD6:15 pmWashington, D.C. Dulles Intl
$496
Find similar
Scandinavian Airlines
Oct 15
IAD10:05 pmWashington, D.C. Dulles Intl
13h 20m
2 stops
LHR4:25 pmLondon Heathrow
Oct 23
LHR6:40 amLondon Heathrow
18h 19m
1 stop
IAD7:59 pmWashington, D.C. Dulles Intl
$497
Find similar

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
Oct 8
IAD5:50 pmWashington, D.C. Dulles Intl
18h 55m
1 stop
LHR5:45 pmLondon Heathrow
Oct 15
LHR7:50 pmLondon Heathrow
24h 30m
1 stop
IAD3:20 pmWashington, D.C. Dulles Intl
$510
Find similar
TAP AIR PORTUGAL
Dec 9
IAD5:30 pmWashington, D.C. Dulles Intl
23h 05m
1 stop
LHR9:35 pmLondon Heathrow
Dec 15
LHR6:30 pmLondon Heathrow
25h 05m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$511
Find similar
TAP AIR PORTUGAL
Sep 15
IAD5:45 pmWashington, D.C. Dulles Intl
20h 05m
1 stop
LHR6:50 pmLondon Heathrow
Nov 10
LHR6:30 pmLondon Heathrow
25h 05m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$539
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 สิงหาคม 18, 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

ศ. 10/24

10:05 pm-4:00 pm

1 stop12h 55m

London Heathrow

ส. 11/8

6:40 am-6:50 pm

1 stop17h 10m

$495

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

พฤ. 10/23

10:05 pm-6:30 pm

1 stop15h 25m

London Heathrow

อา. 10/26

6:40 pm-6:15 pm

1 stop27h 35m

$496

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

พ. 10/15

10:05 pm-4:25 pm

2 stops13h 20m

London Heathrow

พฤ. 10/23

6:40 am-7:59 pm

1 stop18h 19m

$497

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

พฤ. 10/9

10:05 pm-9:35 am

2 stops30h 30m

London Heathrow

พ. 10/15

6:40 pm-7:59 pm

1 stop30h 19m

$499

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

พ. 10/8

5:50 pm-5:45 pm

1 stop18h 55m

London Heathrow

พ. 10/15

7:50 pm-3:20 pm

1 stop24h 30m

$510

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

อ. 12/9

5:30 pm-9:35 pm

1 stop23h 05m

London Heathrow

จ. 12/15

6:30 pm-2:35 pm

1 stop25h 05m

$511

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

จ. 9/15

5:45 pm-6:50 pm

1 stop20h 05m

London Heathrow

จ. 11/10

6:30 pm-2:35 pm

1 stop25h 05m

$539

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

อ. 9/30

8:30 pm-8:20 pm

1 stop18h 50m

London Heathrow

อ. 10/14

9:25 pm-7:20 pm

1 stop26h 55m

$549

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

อา. 9/21

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

อ. 9/30

9:25 pm-7:20 pm

1 stop26h 55m

$551

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

อา. 9/21

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

อ. 9/30

9:25 pm-7:20 pm

1 stop26h 55m

$554

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 typical price of a round-trip flight between Washington, D.C. Dulles Intl Airport and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

The month of September is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, with most prices found around $656. If you’re not able to fly to London Heathrow Airport in September, then October is your next best option. Flight prices from Washington, D.C. Dulles Intl Airport to London Heathrow Airport during October average around $678.

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 $757. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $902.

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 morning. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the morning for as low as $761. 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 $824.

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 $754 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 $693 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 August 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 18% 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

$266

Fastest flight time

10h 25m

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 $266. 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 $495.
The fastest flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport takes 10h 25m
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 10h 25m.

  • 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 $379Free CancellationRating
7.0
103 reviews
Search PLAY flights
Scandinavian AirlinesPriceFrom $409Free CancellationRating
7.4
1,470 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $433Free CancellationRating
7.0
527 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom $441Free CancellationRating
7.1
1,954 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $447Free CancellationRating
6.8
7,330 reviews
Search Lufthansa flights
Air CanadaPriceFrom $549Free CancellationRating
7.1
9,992 reviews
Search Air Canada flights
British AirwaysPriceFrom $549Free CancellationRating
6.6
7,277 reviews
Search British Airways flights
Virgin AtlanticPriceFrom $565Free CancellationRating
7.4
657 reviews
Search Virgin Atlantic flights
United AirlinesPriceFrom $565Free CancellationRating
7.4
8,925 reviews
Search United Airlines flights
Aer LingusPriceFrom $568Free CancellationRating
7.2
1,220 reviews
Search Aer Lingus 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 $572. Generally, Delta has 7 flights on this route every week with an average price of $816. Delta is rated 8.0/10 by our users.

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

    $572 is the best SWISS flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average SWISS ticket price found was closer to $806, however, with flight time and availability significantly affecting the price. SWISS (7.6/10 from 1,699 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 14 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
Hounslow
Gatwick
Dover
Slough
Luton
Guildford
Milton Keynes
Dartford
Crawley
Hayes
Chelmsford
Stansted
Salisbury
Brentwood
Ilford
Swindon
Colchester
Folkestone
Stratford-upon-Avon
Watford

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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