Question 1

Which layover airport has the shortest connection time from London Heathrow Airport to Washington, D.C.?

Accepted Answer

Reykjavik (KEF) has the shortest average layover time for this route: 1h 10m.

Question 2

How many flights depart from London Heathrow Airport to Washington, D.C. on average per day?

Accepted Answer

24 flights are operational daily from London Heathrow Airport to Washington, D.C. as of December 2025. The most popular departure time for this route is 4:00PM, with 100% of flights per day taking off in the afternoon.

Question 3

Can stopping save me money on London Heathrow Airport to Washington, D.C. flights?

Accepted Answer

You could potentially save up to 9% on your flight if you consider stops on a London Heathrow Airport to Washington, D.C. flight.

Question 4

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

Accepted Answer

Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Question 5

How many flights depart from London Heathrow Airport to Washington, D.C. on average per week?

Accepted Answer

170 flights are operational weekly from London Heathrow Airport to Washington, D.C. as of December 2025. The most popular departure day for this route is Fri, with 18% of flights per week taking off on this day.

Question 6

What airlines fly to Washington, D.C.?

Accepted Answer

British Airways, Virgin Atlantic and Delta are the top three most popular airlines that fly to Washington, D.C. from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 61% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 12 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Question 7

What is the cheapest month to fly to Washington, D.C.?

Accepted Answer

The month of September is, on average, the cheapest month to fly to Washington, D.C. from London Heathrow Airport, with most prices found around $648. If you’re not able to fly to Washington, D.C. in September, then November is your next best option. Flight prices from London Heathrow Airport to Washington, D.C. during November average around $663.

Question 8

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

Accepted Answer

According to our data, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 8% of their flights experiencing any sort of delay.

Question 9

Which airport is the most popular layover for flights between London Heathrow Airport and Washington, D.C.?

Accepted Answer

Dublin (DUB) was the most common stop: 46% of momondo users choosing 1-stop flights on this route connected there.

Question 10

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

Accepted Answer

Historically, on average around 17% of flights between London and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 131 minutes.

Question 11

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

Accepted Answer

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the morning have, in the past, seen delays more frequently in comparison.

Question 12

Which layover airport offers the lowest fares from London Heathrow Airport to Washington, D.C.?

Accepted Answer

Flights via Reykjavik (KEF) offer the lowest average round-trip price of $510.

Question 13

What is the typical price of a round-trip flight between London Heathrow Airport and Washington, D.C.?

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from $633 to $799.
The lowest price recently found on this route was $602.

Question 14

What is the cheapest time of day to depart on your flight to Washington, D.C.?

Accepted Answer

In the evening is the cheapest time of day to fly from London Heathrow Airport to Washington, D.C. when you can find flight prices for as low as $762. Flying to Washington, D.C. in the evening is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $852. Of course, these prices can vary depending on the time of year and what airport you fly to.

Question 15

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

Accepted Answer

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

Question 16

How have London Heathrow Airport to Washington, D.C. flight prices changed over time?

Accepted Answer

As of December 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 28% more expensive when compared to flights at the same time last year.

Question 17

What is the cheapest airline that flies from London Heathrow to Washington, D.C.?

Accepted Answer

Icelandair, United Airlines, and Air Canada are the most popular carriers operating from London Heathrow to Washington, D.C.

Question 18

What cabin class options are available on London Heathrow to Washington, D.C. flights?

Accepted Answer

There are 4 cabin classes available to choose from on London Heathrow to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Question 19

Which layover airport has the shortest travel time from London Heathrow Airport to Washington, D.C.?

Accepted Answer

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 10h 50m.

Question 20

How far in advance should I book a flight to Washington, D.C.?

Accepted Answer

You are more likely to see cheaper flights to Washington, D.C. from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $763 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from London Heathrow Airport for as low as $698 on momondo.

Question 21

What is the cheapest day to depart on your flight to Washington, D.C.?

Accepted Answer

On average, the least expensive day to fly to Washington, D.C. from London Heathrow Airport is on a Thursday. momondo users have found tickets for Thursday departures for as low as $751. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Washington, D.C. for around $914.

Question 22

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

Accepted Answer

Prices for flights from London Heathrow Airport to Washington, D.C. are updated daily.

Question 23

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

Accepted Answer

As of December 2025, there are 12 operators available to choose from for flights from London Heathrow Airport to Washington, D.C..

Question 24

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

Accepted Answer

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Washington, D.C..

Question 25

What documentation or ID do you need to fly to Washington, D.C.?

Accepted Answer

The necessary travel and health documents for your Washington, D.C. trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best Price Found	$755
Fastest flight time	8h 15m
Direct flights	Every day
Airports in Washington, D.C.	2 airports

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $320	Free Cancellation	Rating 7.9 8,022 reviews	Search Delta flights
Austrian Airlines	PriceFrom $431	Free Cancellation	Rating 7.6 884 reviews	Search Austrian Airlines flights
TAP AIR PORTUGAL	PriceFrom $473	Free Cancellation	Rating 7.2 2,098 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $510	Free Cancellation	Rating 7.0 592 reviews	Search Icelandair flights
American Airlines	PriceFrom $559	Free Cancellation	Rating 7.2 11,073 reviews	Search American Airlines flights
United Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 9,116 reviews	Search United Airlines flights
Scandinavian Airlines	PriceFrom $572	Free Cancellation	Rating 7.4 1,630 reviews	Search Scandinavian Airlines flights
Lufthansa	PriceFrom $590	Free Cancellation	Rating 6.8 7,657 reviews	Search Lufthansa flights
British Airways	PriceFrom $592	Free Cancellation	Rating 6.7 7,617 reviews	Search British Airways flights
Air Canada	PriceFrom $635	Free Cancellation	Rating 7.1 10,562 reviews	Search Air Canada flights

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

What is the typical price of a round-trip flight between London Heathrow Airport and Washington, D.C.?

What is the cheapest month to fly to Washington, D.C.?

What is the cheapest day to depart on your flight to Washington, D.C.?

What is the cheapest time of day to depart on your flight to Washington, D.C.?

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

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

How far in advance should I book a flight to Washington, D.C.?

What cabin class options are available on London Heathrow to Washington, D.C. flights?

There are 4 cabin classes available to choose from on London Heathrow to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London Heathrow Airport to Washington, D.C. flights?

You could potentially save up to 9% on your flight if you consider stops on a London Heathrow Airport to Washington, D.C. flight.

How have London Heathrow Airport to Washington, D.C. flight prices changed over time?

As of December 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 28% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from London Heathrow to Washington, D.C.?

Icelandair, United Airlines, and Air Canada are the most popular carriers operating from London Heathrow to Washington, D.C.

What airlines fly to Washington, D.C.?

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

Historically, on average around 17% of flights between London and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 131 minutes.

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

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the morning have, in the past, seen delays more frequently in comparison.

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

Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

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

According to our data, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 8% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between London Heathrow Airport and Washington, D.C.?

Dublin (DUB) was the most common stop: 46% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from London Heathrow Airport to Washington, D.C.?

Flights via Reykjavik (KEF) offer the lowest average round-trip price of $510.

Which layover airport has the shortest travel time from London Heathrow Airport to Washington, D.C.?

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 10h 50m.

Which layover airport has the shortest connection time from London Heathrow Airport to Washington, D.C.?

Reykjavik (KEF) has the shortest average layover time for this route: 1h 10m.

How many flights depart from London Heathrow Airport to Washington, D.C. on average per day?

24 flights are operational daily from London Heathrow Airport to Washington, D.C. as of December 2025. The most popular departure time for this route is 4:00PM, with 100% of flights per day taking off in the afternoon.

How many flights depart from London Heathrow Airport to Washington, D.C. on average per week?

170 flights are operational weekly from London Heathrow Airport to Washington, D.C. as of December 2025. The most popular departure day for this route is Fri, with 18% of flights per week taking off on this day.

When to book flights from London Heathrow Airport to Washington, D.C.

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How far is London Heathrow to Washington, D.C. by plane?

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

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

What documentation or ID do you need to fly to Washington, D.C.?

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