Question 1

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 132 minutes.

Question 2

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

Accepted Answer

24 flights are operational daily from London Heathrow Airport to Washington, D.C. Dulles Intl Airport as of January 2026. The most popular departure time for this route is 16:00, with 100% of flights per day taking off in the afternoon.

Question 3

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

Accepted Answer

As of January 2026, prices for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights are approximately 5% cheaper when compared to flights at the same time last year.

Question 4

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

Accepted Answer

Reykjavik (KEF) was the most common stop: 44% of momondo users choosing one-stop flights on this route connected there.

Question 5

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 fewest delays on this route over the last 12 months, with about 8% of their flights experiencing any sort of delay.

Question 6

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

Accepted Answer

Flights via Lisbon (LIS) offer the lowest average return price of £445.

Question 7

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

Accepted Answer

You could potentially save up to 14% on your flight if you consider stops on a London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight.

Question 8

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

Accepted Answer

The month of September is, on average, the cheapest month to fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport, with most prices found around £469. If you aren’t able to travel during the month of September, then book flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport during February instead. Flights to Washington, D.C. Dulles Intl Airport in February, while not as cheap as those in September, still average around £481.

Question 9

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

Accepted Answer

The cheapest time of day to fly to Washington, D.C. Dulles Intl Airport is at midday when flights can be purchased for as low as £581. In contrast, the most expensive time of day to depart to Washington, D.C. Dulles Intl Airport is in the morning when prices are around £584.

Question 10

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

Accepted Answer

As of January 2026, 172 flights take off from London Heathrow Airport and land in Washington, D.C. Dulles Intl Airport each week. The most common flight departure day for this route is Tue, with 15% of weekly flights taking off on this day.

Question 11

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

Accepted Answer

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

Question 12

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

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from £432 to £534.
The lowest price recently found on this route was £395.

Question 13

Which airlines fly to Washington, D.C. Dulles Intl Airport?

Accepted Answer

Virgin Atlantic, British Airways and Lufthansa are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport according to our data. Virgin Atlantic is the first choice among our users, with 44% of people opting to fly with this airline when travelling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 16 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.

Question 14

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 departing in the morning have, in the past, seen delays more frequently in comparison.

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around £544 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport for as low as £521 on momondo.

Question 17

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

Accepted Answer

Dublin (DUB) has the shortest average stopover time for this route: 2h 01m.

Question 18

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

Accepted Answer

According to our data, Thursday is the cheapest day to fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport. The lowest ticket price found for a Thursday departure recently was £570. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. On the other hand, Sunday is the most expensive day to depart from London Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £618.

Question 19

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

Accepted Answer

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

Question 20

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

Accepted Answer

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 11h 43m.

Question 21

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

Accepted Answer

Icelandair and Lufthansa are the most popular carriers operating from London Heathrow to Washington, D.C. Dulles Intl

Question 22

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

Accepted Answer

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

Question 23

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

Accepted Answer

The number of operators available for flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport is 16 as of January 2026.

Question 24

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

Accepted Answer

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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. Dulles Intl Airport.

Question 25

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

Accepted Answer

The travel and health documents you'll need for your trip to Washington, D.C. Dulles Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington, D.C. Dulles Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best price found	£475
Fastest flight time	8h 00m
Direct flights	Every day

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom £184	Free Cancellation	Rating 7.9 8,124 reviews	Search Delta flights
Icelandair	PriceFrom £327	Free Cancellation	Rating 7.1 603 reviews	Search Icelandair flights
TAP AIR PORTUGAL	PriceFrom £341	Free Cancellation	Rating 7.1 2,130 reviews	Search TAP AIR PORTUGAL flights
Aer Lingus	PriceFrom £368	Free Cancellation	Rating 7.2 1,442 reviews	Search Aer Lingus flights
United Airlines	PriceFrom £396	Free Cancellation	Rating 7.4 9,209 reviews	Search United Airlines flights
Lufthansa	PriceFrom £398	Free Cancellation	Rating 6.8 7,749 reviews	Search Lufthansa flights
Austrian Airlines	PriceFrom £407	Free Cancellation	Rating 7.5 895 reviews	Search Austrian Airlines flights
Virgin Atlantic	PriceFrom £408	Free Cancellation	Rating 7.5 678 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £414	Free Cancellation	Rating 6.7 7,704 reviews	Search British Airways flights
KLM	PriceFrom £415	Free Cancellation	Rating 7.7 1,443 reviews	Search KLM flights

Cheap flights from London Heathrow Airport to Washington, D.C. from £371

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from London Heathrow Airport to Washington, D.C.

Cheap return flights

Cheap one-way flights

Cheap last-minute flights

Cheap direct flights

Icelandair flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Our best Icelandair deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets

British Airways flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Our best British Airways deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets

momondo Fare Finder

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

See travel insights to Washington, D.C. from

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