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

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 21m.

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

Reykjavik (KEF) – chosen by Cheapflights users on 44% of 1-stop itineraries from London Heathrow Airport to Washington, D.C. Dulles Intl Airport on Cheapflights.

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

Lisbon (LIS) is the most affordable 1-stop option, with an average round-trip price of $546.

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

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 11h 00m.

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

A quick flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport can take about 12h 35m. United Airlines provides one of the quickest options available for as low as $532. The distance from London Heathrow Airport to Washington, D.C. Dulles Intl Airport is about 3664 mi.

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

Delta, at $320, was found to be the cheapest airline from London Heathrow Airport to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include Scandinavian Airlines and Austrian Airlines. These flights start at 59% lower than the current average price 3 months from now.

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

The best time to book flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport is 75 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of $292). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 day to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

Travelers seeking maximum savings on their London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight should consider departing on Tuesday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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

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

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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

No one likes to see their flight delayed. When booking a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport consider choosing KLM (85%), Air France (85%) or Delta (85%) as they are the most reliable in getting you off to your destination on time.

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

When booking a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, you may want to consider flying on American Airlines, Air Canada or British Airways as they are the most popular for this route.

What is the cheapest day to fly round-trip from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

Users have found that flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport on a Saturday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

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

Users have found that booking a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport at least 50 days early can save you up to 41% on average compared to booking a flight this week. If booking 50 days before your flight isn’t an option for you, users have found flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport for as little as $719 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $1,067 for flights departing within the next 3 days.

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

The best pricing can be found in the month of February. Prices to Washington, D.C. Dulles Intl Airport from London Heathrow Airport average $733. You can even find prices in February for less than $733, as users have found deals to Washington, D.C. Dulles Intl Airport from as low as $305. The month of July appears to be one of the more expensive times to travel to Washington, D.C. Dulles Intl Airport from London Heathrow Airport. Flying in the targeted month can save you up to 19%.

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

When flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 15% versus a flight at noon.

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

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

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

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

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

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

$507+ Cheap Flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Round-trip from	$529 (TravelUp)
One-way from	$507
Popular in	July
Cheapest in	February
Average price	$715
Good round-trip deal	$659 or less
Good one-way deal	$693 or less

Polaris offers lie-flat seats with noise-reducing headphones and large entertainment screens for comfort.

United's Premium Plus seats provide extra legroom, upgraded meals, and two checked bags on international flights.

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$320	Average$926	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$390	Average$833	FlexibilityNo cancel fee	On-time77%
Austrian Airlines	Cheapest$431	Average$984	FlexibilityNo cancel fee	On-time78%
TAP AIR PORTUGAL	Cheapest$473	Average$714	FlexibilityNo cancel fee	On-timeN/A
Icelandair	Cheapest$490	Average$671	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$595	Average$828	FlexibilityNo cancel fee	On-time70%
American Airlines	Cheapest$619	Average$684	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$630	Average$835	FlexibilityNo cancel fee	On-time69%
Air Canada	Cheapest$635	Average$663	FlexibilityNo cancel fee	On-time67%
Aer Lingus	Cheapest$652	Average$802	FlexibilityNo cancel fee	On-timeN/A

$507+ Cheap flights from Heathrow (LHR) to Dulles Intl (IAD)

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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. Dulles Intl are usually found in February or March, booked 75 days in advance, depart on a Thursday or Tuesday and return on a Wednesday

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Cheapest flights from Heathrow to Dulles IntlExplore the most affordable flight options available from Heathrow to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Explore the most affordable flight options available from Heathrow to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

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Best time to book a flight from Heathrow to Dulles Intl

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

Cheapflights Insights

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

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

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

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

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

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

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

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

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

Reviews of airlines servicing Dulles Intl

See what other customers who have flown with Delta, United Airlines, and Virgin Atlantic from London Heathrow Airport to Washington, D.C. Dulles Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Dulles Intl. 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 London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

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

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

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

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

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

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

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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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Cheapest flights from Heathrow to Dulles Intl
Explore the most affordable flight options available from Heathrow to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.