Cheap flights from the United Kingdom to Washington, D.C. from £221

The cheapest month to fly to Washington, D.C. from United Kingdom is in January. Flight prices, which tend to average around £493, are often lower during this time because this is during the off-season. If you don’t want to visit Washington, D.C. in January, then you should wait until February to fly from United Kingdom, when ticket prices are also cheap, with an average price of £493.

On average, the least expensive day to fly to Washington, D.C. from United Kingdom is on a Friday. momondo users have found tickets for Friday departures for as low as £566. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from United Kingdom because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £620.

In the afternoon is the cheapest time of day to fly from United Kingdom to Washington, D.C. when you can find flight prices for as low as £575. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Flights to Washington, D.C. are more costly in the morning, with an average ticket price of £582. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Washington, D.C. from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around £542 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. from United Kingdom for as low as £495 on momondo.

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

British Airways, Delta, and Finnair are the most popular carriers operating from United Kingdom to Washington, D.C.

British Airways, Virgin Atlantic and Aer Lingus are the top three most popular airlines that fly to Washington, D.C. from United Kingdom according to our data. British Airways is the first choice among our users, with 37% of people opting to fly with this airline when travelling to Washington, D.C.. Keep in mind that there are 18 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Historically, on average around 17% of flights between United Kingdom and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 139 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the morning 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 11% of their flights experiencing any sort of delay.

As of July 2026, 30 flights take off from United Kingdom and land in Washington, D.C. each day. The most common flight departure time for this route is 12:00, with 100% of daily flights taking off in the afternoon.

As of July 2026, 214 flights take off from United Kingdom and land in Washington, D.C. each week. The most common flight departure day for this route is Tue, with 16% of weekly flights taking off on this day.