Cheap flights from Washington, D.C. to the United Kingdom from $305

In general, September is the cheapest month to fly from Washington, D.C. to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $631. If you aren’t able to travel to United Kingdom during the month of September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $639.

The cheapest day to depart from Washington, D.C. to United Kingdom is on a Wednesday when prices can be found for as low as $754. The most expensive day to fly to United Kingdom is Saturday, with ticket prices averaging around $875.

According to our data, the cheapest time of day to fly to United Kingdom is in the afternoon. momondo users have found flights departing from Washington, D.C. to United Kingdom in the afternoon for as low as $801. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom are more costly in the evening, with an average ticket price of $812. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Baltimore/Washington 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 $766 when searching weeks out. 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 $722 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, JetBlue, and TAP AIR PORTUGAL are the most popular carriers operating from Washington, D.C. to United Kingdom

British Airways, United Airlines and Icelandair 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 50% of people opting to fly with this airline when traveling to United Kingdom. Keep in mind that there are 19 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 164 minutes.

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

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

According to our data, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 15% of their flights experiencing any sort of delay.

As of March 2026, there are 20 flights per day flying from Washington, D.C. to United Kingdom. The most common time of day flights depart is 7:00PM, with 100% of flights taking off in the evening.

140 flights are operational weekly from Washington, D.C. to United Kingdom as of March 2026. The most popular departure day for this route is Tue, with 24% of flights per week taking off on this day.