Question 1

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

Accepted Answer

Zurich (ZRH) has the shortest average layover time for this route: 1h 13m.

Question 2

Which airline has the best punctuality record on Washington, D.C. to London 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 15% of their flights experiencing any sort of delay.

Question 3

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

Accepted Answer

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 9h 20m.

Question 4

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

Accepted Answer

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $760. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $897.

Question 5

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

Accepted Answer

TAP AIR PORTUGAL, Icelandair, and British Airways are the most popular carriers operating from Washington, D.C. to London Heathrow

Question 6

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

Accepted Answer

Flights via New York (JFK) offer the lowest average round-trip price of $570.

Question 7

What is the cheapest month to fly to London Heathrow Airport?

Accepted Answer

The month of September is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C., with most prices found around $658. If you’re not able to fly to London Heathrow Airport in September, then August is your next best option. Flight prices from Washington, D.C. to London Heathrow Airport during August average around $659.

Question 8

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

Accepted Answer

You are more likely to see cheaper flights to London Heathrow Airport from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport 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 Heathrow Airport from Washington, D.C. for as low as $705 on momondo.

Question 9

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

Accepted Answer

You could potentially save up to 26% on your flight if you consider stops on a Washington, D.C. to London Heathrow Airport flight.

Question 10

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

Accepted Answer

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Washington, D.C. to London Heathrow Airport in the afternoon for as low as $811. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $811.

Question 11

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

Accepted Answer

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

Question 12

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. Saturday has historically seen more delays on average compared to the rest of the week.

Question 13

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

Accepted Answer

Historically, on average around 21% of flights between Washington, D.C. and London have experienced a delay on any given week. The average delay length over the past 12 months has been 159 minutes.

Question 14

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

Accepted Answer

As of December 2025, there are 187 flights per week flying from Washington, D.C. to London Heathrow Airport. The most common day of the week flights depart is Wed, with 17% of flights taking off on this day.

Question 15

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

Accepted Answer

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

Question 16

What airlines fly to London Heathrow Airport?

Accepted Answer

British Airways, Iberia and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from Washington, D.C. according to our data. British Airways is the first choice among our users, with 52% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 17 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

Question 17

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

Accepted Answer

Reykjavik (KEF) was the most common stop: 49% of momondo users choosing 1-stop flights on this route connected there.

Question 18

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

Accepted Answer

As of December 2025, prices for Washington, D.C. to London Heathrow Airport flights are approximately 50% more expensive when compared to flights at the same time last year.

Question 19

What is the most punctual flight time for Washington, D.C. to London 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 20

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

Accepted Answer

26 flights are operational daily from Washington, D.C. to London Heathrow Airport as of December 2025. The most popular departure time for this route is 6:00PM, with 100% of flights per day taking off in the evening.

Question 21

How long does it take to fly to London Heathrow Airport?

Accepted Answer

On average, it takes 7h 05m to fly from Washington, D.C. to London Heathrow Airport if you fly out of Baltimore (the most popular airport in Washington, D.C.) and into London Heathrow Airport (the most popular airport in London Heathrow Airport). If you’re flying out of Washington, D.C. and into London Heathrow Airport, then the flight time is around 8h 12m.

Question 22

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

Accepted Answer

Prices for flights from Washington, D.C. to London Heathrow Airport were last updated today.

Question 23

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

Accepted Answer

As of December 2025, there are 17 operators available to choose from for flights from Washington, D.C. to London Heathrow Airport.

Question 24

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

Accepted Answer

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to London Heathrow Airport.

Question 25

What documentation or ID do you need to fly to London Heathrow Airport?

Accepted Answer

The required travel and health documents for your London Heathrow Airport 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 Heathrow Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best Price Found	$422
Fastest flight time	7h 05m
Direct flights	Mon, Wed, Thu, Fri, Sat and Sun

Airline	Rating	Free Cancellation	Price
JetBlue	PriceFrom $31	Free Cancellation	Rating 7.2 2,899 reviews	Search JetBlue flights
TAP AIR PORTUGAL	PriceFrom $395	Free Cancellation	Rating 7.1 2,089 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $397	Free Cancellation	Rating 6.8 7,626 reviews	Search Lufthansa flights
Scandinavian Airlines	PriceFrom $424	Free Cancellation	Rating 7.4 1,605 reviews	Search Scandinavian Airlines flights
Icelandair	PriceFrom $427	Free Cancellation	Rating 7.0 589 reviews	Search Icelandair flights
PLAY	PriceFrom $429	Free Cancellation	Rating 7.0 103 reviews	Search PLAY flights
Virgin Atlantic	PriceFrom $497	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights
American Airlines	PriceFrom $497	Free Cancellation	Rating 7.2 11,049 reviews	Search American Airlines flights
United Airlines	PriceFrom $506	Free Cancellation	Rating 7.4 9,094 reviews	Search United Airlines flights
KLM	PriceFrom $520	Free Cancellation	Rating 7.7 1,432 reviews	Search KLM flights

Cheap flights from Washington, D.C. to London from $278

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. to London departing on 1/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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