Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

You could potentially save up to 3% on your flight if you consider stops on a London to Washington, D.C. Dulles Intl Airport flight.

Question 3

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

Accepted Answer

Flights connecting via Reykjavik (KEF) have the shortest average one-way travel time: 11h 10m.

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

As of December 2025, prices for London to Washington, D.C. Dulles Intl Airport flights are approximately 33% more expensive when compared to flights at the same time last year.

Question 6

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

Accepted Answer

166 flights are operational weekly from London to Washington, D.C. Dulles Intl Airport as of December 2025. The most popular departure day for this route is Wed, with 16% of flights per week taking off on this day.

Question 7

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

Accepted Answer

There are 4 cabin classes available to choose from on London 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 8

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

Accepted Answer

Aer Lingus, Austrian Airlines, and United Airlines are the most popular carriers operating from London to Washington, D.C. Dulles Intl

Question 9

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

Accepted Answer

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

Question 10

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 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 $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. Dulles Intl Airport from London for as low as $681 on momondo.

Question 11

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 12

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

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from $721 to $1,077.
The lowest price recently found on this route was $626.

Question 13

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

Accepted Answer

Dublin (DUB) was the most common stop: 42% of momondo users choosing 1-stop flights on this route connected there.

Question 14

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 in the evening is the least expensive time of day to depart. momondo users have found prices as low as $743 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $852 on average. Flights to Washington, D.C. Dulles Intl Airport from London at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Question 15

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

Accepted Answer

British Airways, Virgin Atlantic and United Airlines are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from London according to our data. British Airways is the first choice among our users, with 55% 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 16

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 17

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 18

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 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 $653. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $668.

Question 19

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

Accepted Answer

As of December 2025, there are 23 flights per day flying from London to Washington, D.C. Dulles Intl Airport. The most common time of day flights depart is 4:00PM, with 100% of flights taking off in the afternoon.

Question 20

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

Accepted Answer

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

Question 21

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 $756. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from London to Washington, D.C. Dulles Intl Airport for around $917.

Question 22

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

Accepted Answer

Prices for flights from London to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.

Question 23

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

Accepted Answer

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

Question 24

How old do you have to be to fly from London 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 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.

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Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $320	Free Cancellation	Rating 7.9 8,007 reviews	Search Delta flights
Scandinavian Airlines	PriceFrom $390	Free Cancellation	Rating 7.4 1,605 reviews	Search Scandinavian Airlines flights
Austrian Airlines	PriceFrom $431	Free Cancellation	Rating 7.6 879 reviews	Search Austrian Airlines flights
TAP AIR PORTUGAL	PriceFrom $473	Free Cancellation	Rating 7.1 2,089 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $510	Free Cancellation	Rating 7.0 589 reviews	Search Icelandair flights
American Airlines	PriceFrom $559	Free Cancellation	Rating 7.2 11,049 reviews	Search American Airlines flights
United Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 9,094 reviews	Search United Airlines flights
British Airways	PriceFrom $593	Free Cancellation	Rating 6.7 7,571 reviews	Search British Airways flights
Air Canada	PriceFrom $635	Free Cancellation	Rating 7.1 10,517 reviews	Search Air Canada flights
Lufthansa	PriceFrom $649	Free Cancellation	Rating 6.8 7,626 reviews	Search Lufthansa flights

Cheap flights from London to Washington, D.C. from $573

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Washington, D.C. departing on 2/13. 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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