Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Washington, D.C. Dulles Intl Airport to London from $259

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 9/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Washington, D.C. Dulles Intl Airport to London

Cheap round-trip flights

Scandinavian Airlines Logo
8:30 pm - 6:30 pmIAD-LHR
17h 00m1 stop
Scandinavian Airlines Logo
6:40 am - 5:15 pmLHR-IAD
15h 35m1 stop
$493Scandinavian Airlines
Find Deal
Thu, Feb 12 - Mon, Feb 16
Scandinavian Airlines Logo
10:05 pm - 9:40 pmIAD-LHR
18h 35m1 stop
Scandinavian Airlines Logo
6:40 am - 7:59 pmLHR-IAD
18h 19m1 stop
$494Scandinavian Airlines
Find Deal
Wed, Oct 15 - Tue, Oct 21
TAP AIR PORTUGAL Logo
10:20 pm - 10:00 pmIAD-LHR
18h 40m1 stop
TAP AIR PORTUGAL Logo
7:50 pm - 3:20 pmLHR-IAD
24h 30m1 stop
$509TAP AIR PORTUGAL
Find Deal
Sun, Sep 7 - Tue, Sep 16
TAP AIR PORTUGAL Logo
10:20 pm - 3:35 pmIAD-LGW
12h 15m1 stop
TAP AIR PORTUGAL Logo
4:25 pm - 3:20 pmLGW-IAD
27h 55m1 stop
$537TAP AIR PORTUGAL
Find Deal
Tue, Sep 16 - Wed, Sep 24
Icelandair Logo
7:40 pm - 10:55 amIAD-LGW
10h 15m1 stop
Icelandair Logo
11:55 am - 6:30 pmLGW-IAD
11h 35m1 stop
$550Icelandair
Find Deal
Sun, Nov 2 - Mon, Mar 2
Icelandair Logo
11:15 pm - 2:40 pmIAD-LGW
10h 25m1 stop
Icelandair Logo
3:40 pm - 7:20 pmLGW-IAD
32h 40m1 stop
$555Icelandair
Find Deal
Sun, Oct 5 - Tue, Oct 14
Lufthansa Logo
3:25 pm - 4:25 pmIAD-LCY
20h 00m1 stop
Lufthansa Logo
8:45 am - 3:50 pmLCY-IAD
12h 05m1 stop
$666Lufthansa
Find Deal
Tue, Sep 2 - Tue, Sep 9
Lufthansa Logo
5:16 pm - 4:25 pmIAD-LCY
18h 09m2 stops
Lufthansa Logo
8:45 am - 3:50 pmLCY-IAD
12h 05m1 stop
$670Lufthansa
Find Deal
Wed, Sep 3 - Thu, Oct 23
Virgin Atlantic Logo
5:25 pm - 8:10 amIAD-LCY
9h 45m1 stop
Virgin Atlantic Logo
10:00 am - 3:35 pmLCY-IAD
10h 35m1 stop
$687Virgin Atlantic
Find Deal
Sun, Sep 7 - Tue, Sep 16
Virgin Atlantic Logo
5:25 pm - 8:10 amIAD-LCY
9h 45m1 stop
Virgin Atlantic Logo
9:20 am - 3:35 pmLCY-IAD
11h 15m1 stop
$697Virgin Atlantic
Find Deal
Sun, Sep 7 - Tue, Sep 16

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

Our best American Airlines deals on Washington, D.C. Dulles Intl Airport to London flight tickets
American Airlines
Aug 26
IAD5:55 pmWashington, D.C. Dulles Intl
7h 20m
LHR6:15 amLondon Heathrow
Sep 2
LHR6:10 amLondon Heathrow
13h 50m
1 stop
IAD3:00 pmWashington, D.C. Dulles Intl
$736
Find similar
American Airlines
Aug 26
IAD7:25 pmWashington, D.C. Dulles Intl
12h 05m
1 stop
LHR12:30 pmLondon Heathrow
Sep 2
LHR6:10 amLondon Heathrow
13h 50m
1 stop
IAD3:00 pmWashington, D.C. Dulles Intl
$745
Find similar

Aer Lingus flights from Washington, D.C. Dulles Intl Airport to London

Our best Aer Lingus deals on Washington, D.C. Dulles Intl Airport to London flight tickets
Aer Lingus
Aug 26
IAD5:20 pmWashington, D.C. Dulles Intl
9h 40m
1 stop
LHR8:00 amLondon Heathrow
Sep 22
LHR8:50 amLondon Heathrow
15h 05m
1 stop
IAD6:55 pmWashington, D.C. Dulles Intl
$708
Find similar
Aer Lingus
Aug 26
IAD5:20 pmWashington, D.C. Dulles Intl
9h 40m
1 stop
LHR8:00 amLondon Heathrow
Sep 5
LHR9:50 amLondon Heathrow
11h 00m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl
$725
Find similar
Aer Lingus
Aug 26
IAD5:20 pmWashington, D.C. Dulles Intl
9h 40m
1 stop
LHR8:00 amLondon Heathrow
Sep 5
LHR9:50 amLondon Heathrow
11h 00m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl
$726
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to London 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 August 21, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London 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

Thu 2/12

8:30 pm-6:30 pm

1 stop17h 00m

London Heathrow

Mon 2/16

6:40 am-5:15 pm

1 stop15h 35m

$493

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 10/15

10:05 pm-9:40 pm

1 stop18h 35m

London Heathrow

Tue 10/21

6:40 am-7:59 pm

1 stop18h 19m

$494

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 9/7

10:20 pm-10:00 pm

1 stop18h 40m

London Heathrow

Tue 9/16

7:50 pm-3:20 pm

1 stop24h 30m

$509

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Tue 9/16

10:20 pm-3:35 pm

1 stop12h 15m

London Gatwick

Wed 9/24

4:25 pm-3:20 pm

1 stop27h 55m

$537

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Sun 11/2

7:40 pm-10:55 am

1 stop10h 15m

London Gatwick

Mon 3/2

11:55 am-6:30 pm

1 stop11h 35m

$550

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Sun 10/5

11:15 pm-2:40 pm

1 stop10h 25m

London Gatwick

Tue 10/14

3:40 pm-7:20 pm

1 stop32h 40m

$555

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Tue 9/2

3:25 pm-4:25 pm

1 stop20h 00m

London City

Tue 9/9

8:45 am-3:50 pm

1 stop12h 05m

$666

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Wed 9/3

5:16 pm-4:25 pm

2 stops18h 09m

London City

Thu 10/23

8:45 am-3:50 pm

1 stop12h 05m

$670

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Sun 9/7

5:25 pm-8:10 am

1 stop9h 45m

London City

Tue 9/16

10:00 am-3:35 pm

1 stop10h 35m

$687

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Sun 9/7

5:25 pm-8:10 am

1 stop9h 45m

London City

Tue 9/16

9:20 am-3:35 pm

1 stop11h 15m

$697

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to London from

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

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?

The cheapest month to fly to London from Washington, D.C. Dulles Intl Airport is in January. Flight prices, which tend to average around $619, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around $631.

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

The cheapest day to depart from Washington, D.C. Dulles Intl Airport to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $757. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $902. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Washington, D.C. Dulles Intl Airport in the morning is the least expensive time of day to depart. momondo users have found prices as low as $761 when looking at flights departing in the morning. Flights to London are more costly in the afternoon, with an average ticket price of $822. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

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

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

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

You are more likely to see cheaper flights to London 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 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 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 flights?

There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl to London 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 flight prices changed over time?

As of August 2025, prices for Washington, D.C. Dulles Intl Airport to London flights are approximately 28% 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

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

Best Price Found

$385

Fastest flight time

7h 10m

Direct flights

Every day

Airports in London

1 airport
The best one-way flight to London from Washington, D.C. Dulles Intl Airport in the past 72 hours is $385. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to London found on momondo in the last 72 hours is $573.
The fastest flight from Washington, D.C. Dulles Intl Airport to London takes 7h 10m
Direct flights go from Washington, D.C. Dulles Intl Airport to London every day.
There is 1 airport near London: London Heathrow (LHR)
Search flight deals

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

    London is 3677.3 mi away from Washington, D.C. Dulles Intl. By plane, this route typically takes 9h 25m.

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

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

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

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

    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.

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

    The required travel and health documents for your London 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 London. 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 Washington, D.C. Dulles Intl Airport to London?

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

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

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to London with momondo
Airline
Rating
Free Cancellation
Price
PLAYPriceFrom $313Free CancellationRating
7.0
103 reviews
Search PLAY flights
Scandinavian AirlinesPriceFrom $409Free CancellationRating
7.4
1,471 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $433Free CancellationRating
7.0
529 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom $441Free CancellationRating
7.1
1,959 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $447Free CancellationRating
6.8
7,344 reviews
Search Lufthansa flights
Air CanadaPriceFrom $549Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
British AirwaysPriceFrom $549Free CancellationRating
6.7
7,291 reviews
Search British Airways flights
Virgin AtlanticPriceFrom $565Free CancellationRating
7.4
658 reviews
Search Virgin Atlantic flights
United AirlinesPriceFrom $565Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights
Aer LingusPriceFrom $568Free CancellationRating
7.1
1,228 reviews
Search Aer Lingus flights

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

    Delta flight deals from Washington, D.C. Dulles Intl Airport to London start from $572 round-trip. Over the 5 Delta flights for this route in a normal week, average airfare is usually $816 round-trip - but some users have found much cheaper deals with momondo.

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

    Another popular option for Washington, D.C. Dulles Intl Airport to London flights is SWISS (7.6/10, 1,702 ratings). SWISS flies from Washington, D.C. Dulles Intl Airport to London around 14 times per week, with deals starting from $572 round-trip and rising to an average price of around $806.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Luton
Dover
Slough
Milton Keynes
Guildford
Dartford
Crawley
Hayes
Chelmsford
Stansted
Brentwood
Ilford
Folkestone
Colchester
Watford
Richmond
Canterbury
Croydon

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?

momondo does allow users to show only those flights to London from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

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

momondo provides multiple filters to help you find the best flight to London from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 8/26
Tue 9/2
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport