Cheap flights from Washington, D.C. to the United Kingdom from £158

The cheapest month to fly to United Kingdom from Washington, D.C. is in February. Flight prices, which tend to average around £502, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom during the month of February, then departing from Washington, D.C. during the month January is also very affordable. Most momondo users find prices during this month for around £516.

The cheapest day to depart from Washington, D.C. to United Kingdom is on a Monday. Travellers who choose to depart for United Kingdom on a Monday will often find tickets for as low as £604. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. to United Kingdom for around £760.

The cheapest time of day to fly to United Kingdom is in the afternoon when flights can be purchased for as low as £667. Try not to purchase tickets in the evening because they tend to be around £674. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to United Kingdom from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around £679 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from Washington, D.C. for as low as £641 on momondo.

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

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

British Airways, Aer Lingus and United Airlines are the top three most popular airlines that fly to United Kingdom from Washington, D.C. according to our data. British Airways is the first choice among our users, with 45% of people opting to fly with this airline when travelling to United Kingdom. Keep in mind that there are 6 different airlines that fly to United Kingdom on a routine basis, so you have a few additional options to choose from.

Historically, on average around 17% of flights between Washington, D.C. and United Kingdom have experienced a delay on any given week. The average delay length over the past 12 months has been 169 minutes.

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

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

According to our data, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 13% of their flights experiencing any sort of delay.

The number of flights available between Washington, D.C. and United Kingdom is 27 per day as of September 2026. The most frequent departure time is 22:00, with 84% of daily flights leaving in the evening.

The number of flights available between Washington, D.C. and United Kingdom is 190 per week as of September 2026. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.