Cheap flights from London Heathrow Airport to Washington, D.C. from £374

The month of February is, on average, the cheapest month to fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport, with most prices found around £482. If you aren’t able to travel during the month of February, then book flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport during March instead. Flights to Washington, D.C. Dulles Intl Airport in March, while not as cheap as those in February, still average around £495.

According to our data, Friday is the cheapest day to fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport. The lowest ticket price found for a Friday departure recently was £562. 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 £628.

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 £559. 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 £599.

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

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 £545 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 £484 on momondo.

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

You could potentially save up to 13% on your flight if you consider stops on a London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight.

As of October 2026, prices for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights are approximately 43% cheaper when compared to flights at the same time last year.

Icelandair, TAP AIR PORTUGAL, and United Airlines are the most popular carriers operating from London Heathrow to Washington, D.C. Dulles Intl

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 35% 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.

Historically, on average around 16% 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 140 minutes.

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

Saturday 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.

According to our data, United Airlines have had the fewest delays on this route over the last 12 months, with about 10% of their flights experiencing any sort of delay.

Reykjavik (KEF) was the most common stop: 54% of momondo users choosing one-stop flights on this route connected there.

Flights via Lisbon (LIS) offer the lowest average return price of £343.

Flights connecting via Copenhagen (CPH) have the shortest average one-way travel time: 11h 55m.

Paris (CDG) has the shortest average stopover time for this route: 2h 20m.

20 flights are operational daily from London Heathrow Airport to Washington, D.C. Dulles Intl Airport as of October 2026. The most popular departure time for this route is 12:00, with 100% of flights per day taking off in the afternoon.

As of October 2026, 142 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 Sun, with 19% of weekly flights taking off on this day.