Q: How much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Airfare is below average for this route at the moment. Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights typically cost between £769 and £549 in September. The cheapest return flight price found within the last 3 days was £521 on Scandinavian Airlines (14 Sept-17 Sept).

Question 1

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

Accepted Answer

Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £493.

Question 2

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

Accepted Answer

Reykjavik (KEF) – chosen by Cheapflights users on 50% of one-stop itineraries from Washington, D.C. Dulles Intl Airport to London Heathrow Airport on Cheapflights.

Question 3

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

Accepted Answer

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 9h 25m.

Question 4

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

Accepted Answer

About 20% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 168 minutes.

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

Flights via Dublin (DUB) offer the fastest connection on this route, with an average stopover time of 1h 35m.

Question 7

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

Accepted Answer

Over the past year, British Airways have had the lowest number of delays on this route, with just 15% of flights being delayed.

Question 8

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

Accepted Answer

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

Question 9

How much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

Airfare is below average for this route at the moment.Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights typically cost between £769 and £549 in September.
The cheapest return flight price found within the last 3 days was £521 on Scandinavian Airlines (14 Sept-17 Sept).

Question 10

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

Accepted Answer

There are many flights that can get you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 7h 20m. Fly via KLM, Turkish Airlines, or United Airlines to get the fastest option. Airlines will cover a distance of 3664 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

Question 11

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

Accepted Answer

Currently priced at £306, Lufthansa will fly you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Virgin Atlantic and British Airways - these airlines can fly you to your destination from £374 and £386, respectively. You may be able to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport for 47% less than the average price by searching for these airlines.

Question 12

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

Accepted Answer

For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as £158. Users have also found prices from £259 and £264 on Virgin Atlantic and British Airways, respectively.

Question 13

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

Accepted Answer

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 62 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Question 14

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

Accepted Answer

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £504). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £808). 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.

Question 15

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

Accepted Answer

The most flights from IAD to LHR are scheduled on a Monday (28 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (17 on average).

Question 16

E

Accepted Answer

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Question 17

E

Accepted Answer

If weather is an important factor for your trip to London Heathrow Airport, 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Question 18

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

Accepted Answer

On average you can expect to pay £804 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £379 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £467.

Question 19

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

Accepted Answer

Before booking your flight to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, check out the most reliable airlines to get you to your destination on time: United Airlines (89%), Delta (85%), Virgin Atlantic( 85%).

Question 20

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

Accepted Answer

Before booking your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport check out the most popular airlines for this route: British Airways, Virgin Atlantic or United Airlines.

Question 21

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

Accepted Answer

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 Heathrow Airport as you normally would.

Question 22

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

Accepted Answer

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

Question 23

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

Accepted Answer

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

Question 24

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

Accepted Answer

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

Question 25

How does Cheapflights help users find flights from Dulles Intl to Heathrow?

Accepted Answer

Deals for Dulles Intl to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Question 26

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Heathrow?

Accepted Answer

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Dulles Intl to Heathrow.

Question 27

Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?

Accepted Answer

Need flexible booking options for your flight to Heathrow from Dulles Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Question 28

Can Cheapflights notify me if prices for flights from Dulles Intl to Heathrow become cheaper?

Accepted Answer

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

Round-trip from	£521
One-way from	£278
Popular in	June
Cheapest in	August
Average price	£577
Good round-trip deal	£720 or less
Good one-way deal	£417 or less

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest£306	Average£401	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Virgin Atlantic	Cheapest£374	Average£564	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£386	Average£569	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£486	Average£654	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £278

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Dulles Intl to Heathrow

Cheapest flights from Dulles Intl to HeathrowExplore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Best flights from Dulles Intl to HeathrowDiscover carefully curated flight deals from Dulles Intl to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 April 2026.

Discover carefully curated flight deals from Dulles Intl to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 April 2026.

Direct flights from Dulles Intl to HeathrowExplore direct flight options from Dulles Intl to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 28 April 2026.

Explore direct flight options from Dulles Intl to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 28 April 2026.

Last-minute flights from Dulles Intl to HeathrowDiscover last-minute flight deals from Dulles Intl to Heathrow. Data last updated 28 April 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Heathrow. Data last updated 28 April 2026 and is based on user searches.

One-way flights from Dulles Intl to HeathrowSearch for one-way flight options from Dulles Intl to Heathrow. Find affordable one-way fares based on user searches. Data last updated 28 April 2026.

Search for one-way flight options from Dulles Intl to Heathrow. Find affordable one-way fares based on user searches. Data last updated 28 April 2026.

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

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

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

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

How much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

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

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

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

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

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

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

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

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

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

Reviews of airlines servicing Heathrow

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

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

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

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

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

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

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

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

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Alternative routes for Dulles Intl to Heathrow

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Cheapest flights from Dulles Intl to Heathrow
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Best flights from Dulles Intl to Heathrow
Discover carefully curated flight deals from Dulles Intl to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 April 2026.

Direct flights from Dulles Intl to Heathrow
Explore direct flight options from Dulles Intl to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 28 April 2026.

Last-minute flights from Dulles Intl to Heathrow
Discover last-minute flight deals from Dulles Intl to Heathrow. Data last updated 28 April 2026 and is based on user searches.

One-way flights from Dulles Intl to Heathrow
Search for one-way flight options from Dulles Intl to Heathrow. Find affordable one-way fares based on user searches. Data last updated 28 April 2026.