Cheap flights from Washington, D.C. Dulles Intl Airport to the United Kingdom from £229

The cheapest month to fly to United Kingdom from Washington, D.C. Dulles Intl Airport is in January. Flight prices, which tend to average around £306, 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 January, then departing from Washington, D.C. Dulles Intl Airport during the month February is also very affordable. Most momondo users find prices during this month for around £307.

The cheapest day to depart from Washington, D.C. Dulles Intl Airport to United Kingdom is on a Tuesday. Travellers who choose to depart for United Kingdom on a Tuesday will often find tickets for as low as £545. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. Dulles Intl Airport to United Kingdom for around £600.

The cheapest time of day to fly to United Kingdom is in the afternoon when flights can be purchased for as low as £534. Try not to purchase tickets in the evening because they tend to be around £590. 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. Dulles Intl - United Kingdom flight prices

You are more likely to see cheaper flights to United Kingdom from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around £578 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. Dulles Intl Airport for as low as £538 on momondo.

Icelandair, British Airways, and Aer Lingus are the most popular carriers operating from Washington, D.C. Dulles Intl to United Kingdom

British Airways, United Airlines and Virgin Atlantic are the top three most popular airlines that fly to United Kingdom from Washington, D.C. Dulles Intl Airport 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 5 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 20% 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 168 minutes.

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

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

According to our data, British Airways have had the fewest delays on this route over the last 12 months, with about 15% of their flights experiencing any sort of delay.

30 flights are operational daily from Washington, D.C. Dulles Intl Airport to United Kingdom as of May 2026. The most popular departure time for this route is 22:00, with 83% of flights per day taking off in the evening.

As of May 2026, 211 flights take off from Washington, D.C. Dulles Intl Airport and land in United Kingdom each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.