How long is the flight from Washington, D.C. Dulles Intl Airport to London?

Airlines like United Airlines, Virgin Atlantic, and Delta fly from Washington, D.C. Dulles Intl Airport to London in about 7h 20m. The time it takes to get you to your destination can typically vary by up to 9h 25m. Washington, D.C. Dulles Intl Airport and London are separated by a distance of 3664 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London round-trip?

According to our current data, TAP AIR PORTUGAL ($309), Virgin Atlantic ($449), and Iberia ($484) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to London. TAP AIR PORTUGAL is priced at 62% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London one-way?

The cheapest airline one-way is KLM, with whom users have recently found tickets for as low as $229. However, be on the lookout for offers from Icelandair and Iberia, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to London for a low price.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

What are the most popular routes from Washington, D.C. Dulles Intl Airport to London?

When deciding which route to take from Washington, D.C. Dulles Intl Airport to London consider Washington, D.C. Dulles Intl - London Heathrow, Washington, D.C. Dulles Intl - London Gatwick or Washington, D.C. Dulles Intl - London City as they are the most popular.

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London?

While on average a flight from Washington, D.C. Dulles Intl Airport to London is generally $3,211, our data shows the cheapest flight currently is $354. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $343 for that flight.

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to London on time: Aer Lingus (73%), Iberia (73%), KLM (68%).

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to London?

The most popular airlines flying from Washington, D.C. Dulles Intl Airport to London are British Airways, United Airlines and American Airlines. Something to consider prior to booking your flight.

Most accurate provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-London flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Dulles Intl to London that include hotel bookings?

Yes. In addition to deals on Dulles Intl to London flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Dulles Intl to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to London.

Can I find deals for business class flights from Dulles Intl to London?

Yes. Cheapflights offers flight deals from Dulles Intl to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$272+ Cheap Flights from Washington, D.C. Dulles Intl Airport to London

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London are usually found in February or November, booked 74 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from Dulles Intl to London

Cheapest

Best

Last-minute

One-way

Cheapest flights from Dulles Intl to London
Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.

Tue 10/209:45 am -

2 stops20h 55m

Tue 10/2710:25 am -

2 stops35h 35m

Deal found 9/13

$633

Tue 10/205:15 pm -

1 stop11h 00m

Tue 10/277:45 am -

1 stop13h 00m

Deal found 9/13

$657

Tue 10/205:15 pm -

1 stop10h 05m

Tue 10/278:50 am -

1 stop11h 55m

Deal found 9/13

$666

Tue 10/209:05 pm -

1 stop10h 35m

Tue 10/2712:10 pm -

1 stop12h 10m

Deal found 9/13

$673

Sun 9/204:00 pm -

2 stops19h 50m

Tue 9/293:55 pm -

2 stops26h 35m

Deal found 9/13

$683

Tue 9/298:20 pm -

1 stop16h 30m

Tue 10/69:25 am -

1 stop12h 20m

Deal found 9/14

$683

Mon 9/218:20 pm -

1 stop20h 25m

Thu 10/86:00 am -

1 stop15h 45m

Deal found 9/13

$683

Sat 12/55:25 pm -

2 stops21h 55m

Fri 12/116:00 am -

2 stops19h 30m

Deal found 9/13

$684

Thu 10/299:50 pm -

1 stop10h 10m

Thu 11/56:15 am -

1 stop14h 30m

Deal found 9/14

$685

Sun 9/2010:05 pm -

Nonstop7h 35m

Tue 9/293:50 pm -

Nonstop8h 25m

Deal found 9/13

$686

Sun 10/119:45 am -

3 stops29h 20m

Tue 10/208:50 pm -

3 stops28h 35m

Deal found 9/14

$687

Sun 11/18:50 pm -

1 stop18h 20m

Wed 11/48:50 am -

1 stop15h 30m

Deal found 9/14

$690

Best flights from Dulles Intl to London
Discover carefully curated flight deals from Dulles Intl to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.

Fri 11/64:30 pm -

2 stops20h 50m

Wed 11/117:25 am -

2 stops17h 40m

Deal found 9/15

$699

Wed 10/146:35 pm -

Nonstop7h 20m

Tue 10/2712:05 pm -

1 stop33h 55m

Deal found 9/13

$714

Mon 9/286:15 pm -

1 stop16h 45m

Wed 10/75:00 pm -

2 stops23h 50m

Deal found 9/15

$752

Tue 1/196:40 pm -

1 stop16h 05m

Tue 1/2610:00 am -

1 stop11h 30m

Deal found 9/17

$752

Wed 12/910:30 pm -

2 stops30h 30m

Fri 12/2510:40 am -

1 stop14h 50m

Deal found 9/17

$793

Fri 11/276:15 pm -

1 stop10h 15m

Mon 2/110:00 am -

1 stop10h 55m

Deal found 9/15

$876

Wed 3/102:30 pm -

1 stop14h 25m

Tue 3/165:20 pm -

1 stop23h 25m

Deal found 9/13

$885

Sat 1/169:05 pm -

1 stop28h 15m

Wed 1/277:30 am -

1 stop16h 35m

Deal found 9/17

$887

Thu 10/110:20 pm -

1 stop12h 20m

Mon 10/511:00 am -

1 stop13h 25m

Deal found 9/17

$911

Sat 12/197:40 pm -

1 stop18h 50m

Fri 1/88:35 pm -

1 stop26h 55m

Deal found 9/14

$979

Sun 11/158:50 pm -

1 stop10h 50m

Sun 11/221:15 pm -

1 stop11h 05m

Deal found 9/13

$1,058

Tue 9/296:35 pm -

Nonstop7h 20m

Tue 11/36:50 am -

1 stop12h 40m

Deal found 9/17

$718

Wed 10/75:15 pm -

1 stop14h 20m

Sun 10/119:00 am -

1 stop15h 25m

Deal found 9/17

$718

Sun 1/176:40 pm -

1 stop16h 05m

Tue 1/2610:00 am -

1 stop11h 30m

Deal found 9/17

$752

Wed 11/46:55 pm -

Nonstop7h 25m

Sun 11/81:05 pm -

Nonstop8h 40m

Deal found 9/17

$779

Sun 11/1510:30 pm -

2 stops17h 05m

Sun 11/2210:40 am -

1 stop14h 55m

Deal found 9/13

$794

Sun 10/183:45 pm -

1 stop9h 45m

Wed 10/286:50 am -

1 stop12h 40m

Deal found 9/16

$724

Sun 11/157:40 pm -

2 stops14h 10m

Sat 11/217:15 am -

2 stops16h 15m

Deal found 9/17

$727

Wed 10/2812:01 pm -

1 stop15h 04m

Mon 11/210:00 am -

1 stop10h 55m

Deal found 9/15

$779

Wed 1/276:00 am -

2 stops22h 00m

Sat 2/610:00 am -

1 stop11h 30m

Deal found 9/15

$805

Mon 1/189:05 pm -

1 stop28h 25m

Wed 1/277:30 am -

1 stop16h 35m

Deal found 9/17

$887

Wed 11/189:20 pm -

1 stop38h 00m

Mon 11/3010:55 am -

1 stop29h 50m

Deal found 9/15

$895

Tue 11/247:40 pm -

1 stop14h 25m

Sun 12/66:00 am -

1 stop17h 30m

Deal found 9/15

$746

Mon 12/146:05 am -

1 stop10h 15m

Tue 12/1511:05 am -

2 stops49h 20m

Deal found 9/15

$767

Mon 1/256:15 pm -

1 stop10h 15m

Sat 1/3010:00 am -

1 stop10h 55m

Deal found 9/15

$942

Thu 11/266:40 pm -

1 stop16h 05m

Tue 2/210:00 am -

1 stop11h 30m

Deal found 9/15

$794

Fri 1/159:20 pm -

1 stop31h 35m

Tue 1/195:20 pm -

1 stop31h 05m

Deal found 9/14

$895

Sun 2/146:00 am -

2 stops22h 00m

Sun 2/2110:00 am -

2 stops19h 20m

Deal found 9/17

$814

Fri 11/207:40 pm -

1 stop13h 15m

Wed 11/258:00 am -

1 stop15h 30m

Deal found 9/13

$755

Tue 12/157:40 pm -

1 stop10h 15m

Thu 12/3111:55 am -

1 stop11h 35m

Deal found 9/14

$1,038

Last-minute flights from Dulles Intl to London
Discover last-minute flight deals from Dulles Intl to London. Data last updated September 18, 2026 and is based on user searches.

Sun 9/204:00 pm -

2 stops19h 50m

Tue 9/293:55 pm -

2 stops26h 35m

Deal found 9/13

$683

Sun 9/2010:05 pm -

Nonstop7h 35m

Tue 9/293:50 pm -

Nonstop8h 25m

Deal found 9/13

$686

Mon 9/218:20 pm -

1 stop20h 25m

Thu 10/86:00 am -

1 stop15h 45m

Deal found 9/13

$683

Tue 9/298:20 pm -

1 stop16h 30m

Tue 10/69:25 am -

1 stop12h 20m

Deal found 9/14

$683

Sat 10/104:00 pm -

2 stops18h 15m

Mon 10/198:45 pm -

2 stops24h 20m

Deal found 9/14

$691

Sun 10/119:45 am -

3 stops29h 20m

Tue 10/208:50 pm -

3 stops28h 35m

Deal found 9/14

$687

Mon 10/128:30 pm -

1 stop13h 10m

Wed 10/213:40 pm -

1 stop11h 35m

Deal found 9/14

$691

Tue 10/209:45 am -

2 stops20h 55m

Tue 10/2710:25 am -

2 stops35h 35m

Deal found 9/13

$633

Tue 10/205:15 pm -

1 stop11h 00m

Tue 10/277:45 am -

1 stop13h 00m

Deal found 9/13

$657

Tue 10/205:15 pm -

1 stop10h 05m

Tue 10/278:50 am -

1 stop11h 55m

Deal found 9/13

$666

Tue 10/209:05 pm -

1 stop10h 35m

Tue 10/2712:10 pm -

1 stop12h 10m

Deal found 9/13

$673

Thu 10/299:50 pm -

1 stop10h 10m

Thu 11/56:15 am -

1 stop14h 30m

Deal found 9/14

$685

One-way flights from Dulles Intl to London
Search for one-way flight options from Dulles Intl to London. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.

Fri 9/256:36 pm -

2 stops34h 24m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/13

$272

Tue 10/2011:12 am -

1 stop17h 48m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/14

$329

Wed 1/68:10 pm -

1 stop11h 40m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/15

$329

Wed 3/1011:05 am -

2 stops14h 45m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/14

$329

Fri 11/277:40 pm -

2 stops20h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/15

$329

Sat 10/311:25 am -

3 stops26h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/14

$330

Fri 11/277:40 pm -

2 stops16h 15m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/16

$330

Mon 12/287:40 pm -

1 stop10h 10m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/16

$330

Mon 11/307:40 pm -

3 stops22h 10m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/16

$330

Sun 11/297:40 pm -

3 stops17h 20m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/14

$331

Tue 10/138:30 pm -

3 stops17h 45m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/17

$331

Wed 11/47:40 pm -

3 stops21h 40m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/17

$331

Find flight deals from Dulles Intl to London

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$615 (oojo)
One-way from	$272 (Kiwi.com)
Popular in	June
Cheapest in	February
Average price	$866
Good round-trip deal	$950 or less
Good one-way deal	$459 or less

Provider with most accurate pricing for Washington, D.C. Dulles Intl-London (LON) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-London (LON) flights.

Search Deals

From Washington, D.C. Dulles Intl to London (LON)

Search Deals

One-way flight from Washington, D.C. Dulles Intl to London (LON)

Search Deals

Highest demand for flights based on searches. 19% potential increase in price ($196 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London (LON).

Search Deals

Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London (LON).

Search Deals

Cheapflights Fare Finder

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

Cheapest round-trip

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LGW London Gatwick

IADLGW

Washington, D.C. Dulles Intl

Tue 1/19

6:40 pm-3:45 pm

1 stop16h 05m

London Gatwick

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$330

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LTN London Luton

IADLTN

Washington, D.C. Dulles Intl

Fri 11/27

7:40 pm-9:05 pm

2 stops20h 25m

London Luton

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$331

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Wed 1/13

12:45 pm-7:10 am

2 stops13h 25m

London Heathrow

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$333

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - SEN London Southend

IADSEN

Washington, D.C. Dulles Intl

Thu 10/1

3:50 pm-8:40 am

3 stops35h 50m

London Southend

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$334

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LGW London Gatwick

IADLGW

Washington, D.C. Dulles Intl

Wed 1/13

6:30 pm-3:45 pm

2 stops16h 15m

London Gatwick

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$334

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LTN London Luton

IADLTN

Washington, D.C. Dulles Intl

Wed 1/6

7:40 pm-7:35 am

2 stops30h 55m

London Luton

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$336

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LGW London Gatwick

IADLGW

Washington, D.C. Dulles Intl

Sun 10/11

11:20 pm-8:55 pm

2 stops16h 35m

London Gatwick

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$338

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LCY London City

IADLCY

Washington, D.C. Dulles Intl

Mon 1/18

6:15 pm-8:50 am

1 stop9h 35m

London City

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$342

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LCY London City

IADLCY

Washington, D.C. Dulles Intl

Wed 1/6

5:00 pm-4:35 pm

2 stops18h 35m

London City

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$346

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LTN London Luton

IADLTN

Washington, D.C. Dulles Intl

Mon 11/9

7:40 pm-6:00 pm

2 stops17h 20m

London Luton

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$350

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 60 resultsSorted by cheapest first

...

Compare providers for flights from Dulles Intl to London

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to London in September.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
Ovago	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy2 stars	Trust Score*1 star
JustAirTicket	Price Accuracy-	Trust Score*1 star
Cheapfaremart	Price Accuracy-	Trust Score*1 star
BusinessClass	Price Accuracy-	Trust Score*3 stars
oojo	Price Accuracy3 stars	Trust Score*2 stars
Super.com	Price Accuracy-	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-London flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Dulles Intl to London

Have a flexible travel schedule? Discover the best time to fly to London from Dulles Intl with our price prediction graph.

IAD-LON

IAD-LTN

IAD-LHR

IAD-LGW

IAD-LCY

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to London

IAD-LON

IAD-LTN

IAD-LHR

IAD-LGW

IAD-LCY

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London?

Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $684). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $1,276). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to LON?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to London as you normally would.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to London

The most flights from IAD to LON are scheduled on a Thursday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to London?

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to London flights typically cost between $697 and $1,065 in January.
The cheapest round-trip price found within the last 5 days was $615 on Icelandair (Jan 15-Jan 20).

What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to London?

Copenhagen (CPH) – chosen by Cheapflights users on 32% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to London on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to London?

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $494.

What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to London?

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 9h 58m.

Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to London?

Flights via Zurich (ZRH) offer the fastest connection on this route, with an average layover time of 1h 20m.

How often are flights from Washington, D.C. to London delayed?

About 17% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 169 minutes.

What is the most punctual flight time for Washington, D.C. to London flights?

Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Monday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Washington, D.C. to London flights?

Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 13% of flights being delayed.

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London?

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to London, you should look to book at least 73 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

The best insider tips for Washington, D.C. Dulles Intl Airport to London flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to London trip

Our travel experts

Ramsey Qubein

Expert on LHR and IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Get a feel of what it's like to fly with United Airlines,Virgin Atlantic, andAmerican Airlines from Washington, D.C. Dulles Intl Airport to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

10,224 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

United Airlines

7.4

Good

10,224 reviews

United Airlines

7.4

Good

10,224 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

Virgin Atlantic

7.4

Good

694 reviews

United Airlines

7.4

Good

10,224 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

American Airlines

7.1

Good

12,077 reviews

United Airlines

7.4

Good

10,224 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

Icelandair

6.9

Okay

746 reviews

United Airlines

7.4

Good

10,224 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

British Airways

6.7

Okay

8,229 reviews

United Airlines

7.4

Good

10,224 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

Related info for your journey

How long is the flight from Washington, D.C. Dulles Intl Airport to London?
Airlines like United Airlines, Virgin Atlantic, and Delta fly from Washington, D.C. Dulles Intl Airport to London in about 7h 20m. The time it takes to get you to your destination can typically vary by up to 9h 25m. Washington, D.C. Dulles Intl Airport and London are separated by a distance of 3664 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London round-trip?
According to our current data, TAP AIR PORTUGAL ($309), Virgin Atlantic ($449), and Iberia ($484) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to London. TAP AIR PORTUGAL is priced at 62% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London one-way?
The cheapest airline one-way is KLM, with whom users have recently found tickets for as low as $229. However, be on the lookout for offers from Icelandair and Iberia, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to London for a low price.
What are the most popular routes from Washington, D.C. Dulles Intl Airport to London?
When deciding which route to take from Washington, D.C. Dulles Intl Airport to London consider Washington, D.C. Dulles Intl - London Heathrow, Washington, D.C. Dulles Intl - London Gatwick or Washington, D.C. Dulles Intl - London City as they are the most popular.
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to London on time: Aer Lingus (73%), Iberia (73%), KLM (68%).
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London?
While on average a flight from Washington, D.C. Dulles Intl Airport to London is generally $3,211, our data shows the cheapest flight currently is $354. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $343 for that flight.
Can I find deals for flights from Dulles Intl to London that include hotel bookings?
Yes. In addition to deals on Dulles Intl to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to London.
Can I find deals for business class flights from Dulles Intl to London?
Yes. Cheapflights offers flight deals from Dulles Intl to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London?
Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $684). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $1,276). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 10 airlines flying from Dulles Intl to London

Airline	Cheapest	Average	Flexibility	On-time
TAP AIR PORTUGAL	Cheapest$309	Average$546	FlexibilityNo cancel fee	On-timeN/A
Virgin Atlantic	Cheapest$449	Average$925	FlexibilityNo cancel fee	On-time72%
Iberia	Cheapest$484	Average$818	FlexibilityNo cancel fee	On-time77%
Icelandair	Cheapest$487	Average$670	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$508	Average$1,032	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$571	Average$831	FlexibilityNo cancel fee	On-time77%
Air France	Cheapest$581	Average$1,067	FlexibilityNo cancel fee	On-time77%
SWISS	Cheapest$593	Average$985	FlexibilityNo cancel fee	On-time79%
Aer Lingus	Cheapest$607	Average$867	FlexibilityNo cancel fee	On-timeN/A
British Airways	Cheapest$610	Average$946	FlexibilityNo cancel fee	On-time70%

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$272+ Cheap flights from Dulles Intl (IAD) to London (LON)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/25. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Dulles Intl to London

Cheapest flights from Dulles Intl to LondonExplore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.

Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.

Best flights from Dulles Intl to LondonDiscover carefully curated flight deals from Dulles Intl to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.

Discover carefully curated flight deals from Dulles Intl to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.

Last-minute flights from Dulles Intl to LondonDiscover last-minute flight deals from Dulles Intl to London. Data last updated September 18, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to London. Data last updated September 18, 2026 and is based on user searches.

One-way flights from Dulles Intl to LondonSearch for one-way flight options from Dulles Intl to London. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.

Search for one-way flight options from Dulles Intl to London. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.

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Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London that are best for you.

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Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to London in September.

Best time to book a flight from Dulles Intl to London

Have a flexible travel schedule? Discover the best time to fly to London from Dulles Intl with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London?

What is the cheapest time of day to fly from IAD to LON?

Find hourly flight availability from Dulles Intl to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 18, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to London as you normally would.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to London

The most flights from IAD to LON are scheduled on a Thursday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to London?

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to London flights typically cost between $697 and $1,065 in January.The cheapest round-trip price found within the last 5 days was $615 on Icelandair (Jan 15-Jan 20).

What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to London?

Share of 1-stop round-trip flights from Washington, D.C. Dulles Intl Airport to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Copenhagen (CPH) – chosen by Cheapflights users on 32% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to London on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to London?

Average round-trip fare for 1-stop flights from Washington, D.C. Dulles Intl Airport to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $494.

What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to London?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 9h 58m.

Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to London?

Average layover duration for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Zurich (ZRH) offer the fastest connection on this route, with an average layover time of 1h 20m.

How often are flights from Washington, D.C. to London delayed?

About 17% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 169 minutes.

What is the most punctual flight time for Washington, D.C. to London flights?

Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Monday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Washington, D.C. to London flights?

Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 13% of flights being delayed.

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London?

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to London, you should look to book at least 73 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

The best insider tips for Washington, D.C. Dulles Intl Airport to London flights

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Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to London trip

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Related info for your journey

How long is the flight from Washington, D.C. Dulles Intl Airport to London?

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London round-trip?

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London one-way?

What are the most popular routes from Washington, D.C. Dulles Intl Airport to London?

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London?

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London?

Can I find deals for flights from Dulles Intl to London that include hotel bookings?

How can I find direct flights from Dulles Intl to London?

Can I find deals for business class flights from Dulles Intl to London?

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London?

Cheapest flights from Dulles Intl to London
Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.

Best flights from Dulles Intl to London
Discover carefully curated flight deals from Dulles Intl to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.

Last-minute flights from Dulles Intl to London
Discover last-minute flight deals from Dulles Intl to London. Data last updated September 18, 2026 and is based on user searches.

One-way flights from Dulles Intl to London
Search for one-way flight options from Dulles Intl to London. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.

Washington, D.C. Dulles Intl Airport to London flights typically cost between $697 and $1,065 in January.
The cheapest round-trip price found within the last 5 days was $615 on Icelandair (Jan 15-Jan 20).