Question 1

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

Accepted Answer

Flying to Washington, D.C. Dulles Intl Airport from London Heathrow Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $818 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $851 on average. Flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Question 2

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

Accepted Answer

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Washington, D.C. Dulles Intl Airport.

Question 3

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

Accepted Answer

Wednesday 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 4

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

Accepted Answer

British Airways, United Airlines and Virgin Atlantic are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 53% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 12 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 5

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, 176 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 6

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 7

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 8

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 $748 when searching weeks out. 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 $716 on momondo.

Question 9

Which layover 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 layover time for this route: 2h 18m.

Question 10

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 11

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

Accepted Answer

Our data shows that Thursday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $744. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Washington, D.C. Dulles Intl Airport for around $904.

Question 12

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

Accepted Answer

In general, September is the cheapest month to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $644. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $661.

Question 13

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 $594 to $733.
The lowest price recently found on this route was $543.

Question 14

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

Accepted Answer

As of January 2026, 25 flights take off from London Heathrow Airport and land in Washington, D.C. Dulles Intl Airport each day. The most common flight departure time for this route is 4:00PM, with 100% of daily flights taking off in the afternoon.

Question 15

Which layover 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: 12h 03m.

Question 16

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

Accepted Answer

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $575.

Question 17

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 18

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 19

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 20

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

Accepted Answer

Dublin (DUB) was the most common stop: 71% of momondo users choosing 1-stop flights on this route connected there.

Question 21

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 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 are updated daily.

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 12 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

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. Dulles Intl Airport.

Question 25

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

Accepted Answer

The required travel and health documents for your Washington, D.C. Dulles Intl 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 Washington, D.C. Dulles Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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Airline	Rating	Free Cancellation	Price
Scandinavian Airlines	PriceFrom $271	Free Cancellation	Rating 7.3 1,674 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $320	Free Cancellation	Rating 7.9 8,128 reviews	Search Delta flights
Austrian Airlines	PriceFrom $431	Free Cancellation	Rating 7.5 895 reviews	Search Austrian Airlines flights
Icelandair	PriceFrom $466	Free Cancellation	Rating 7.1 606 reviews	Search Icelandair flights
TAP AIR PORTUGAL	PriceFrom $473	Free Cancellation	Rating 7.1 2,130 reviews	Search TAP AIR PORTUGAL flights
American Airlines	PriceFrom $559	Free Cancellation	Rating 7.2 11,206 reviews	Search American Airlines flights
Lufthansa	PriceFrom $563	Free Cancellation	Rating 6.8 7,754 reviews	Search Lufthansa flights
United Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 9,214 reviews	Search United Airlines flights
British Airways	PriceFrom $572	Free Cancellation	Rating 6.7 7,705 reviews	Search British Airways flights
Air Canada	PriceFrom $635	Free Cancellation	Rating 7.1 10,667 reviews	Search Air Canada flights

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

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

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

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

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

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

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

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

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

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.

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

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Washington, D.C. Dulles Intl Airport.

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

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.

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

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

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

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 132 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?

Wednesday 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. Dulles Intl Airport?

Dublin (DUB) was the most common stop: 71% 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. Dulles Intl Airport?

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $575.

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

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 12h 03m.

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

Dublin (DUB) has the shortest average layover time for this route: 2h 18m.

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

As of January 2026, 25 flights take off from London Heathrow Airport and land in Washington, D.C. Dulles Intl Airport each day. The most common flight departure time for this route is 4:00PM, with 100% of daily flights taking off in the afternoon.

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

As of January 2026, 176 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.

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

Cheap London Heathrow Airport to Washington, D.C. Dulles Intl Airport (LHR to IAD) flight deals and tips

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

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

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

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