WAS to LON, to Cheap Flights

Based on HopeGoo data, Delta Air Lines offers one-way fares as low as US$176 on Cheapest nonstop routes (e.g. DCA to LGW on Wed, Mar 25), while TAP Air Portugal offers Cheapest nonstop round-trips from US$445 departing on Mon, Mar 9 and returning on Mon, Mar 16.

At the moment, you can catch a nonstop flight from Washington D.C. to London with the following airlines, including: United Airlines Selected airlines are based on historical data collected from flight bookings users made on HopeGoo within the last 90 days.

It takes about 7 hours 28 minutes to fly from Washington D.C. to London.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Washington D.C. to London is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

Based on HopeGoo data in the past 4 weeks, there is 25 flight per week flying from Washington D.C. to London. You can check the weekly schedule for popular airlines on this route below: United Airlines: S/M/T/W/T/F/S -- UA924 (22:37) United Airlines: S/M/T/W/T/F/S -- UA918 (22:26)

To find best deals on flights from Washington D.C. to London, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Wed, Mar 25, with one-way flights priced at just US$176. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Virgin Atlantic. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for London travel is around July. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Washington D.C. to London is November, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Washington D.C. to London on February 26, 2026 with TAP Air Portugal, with prices starting at US$449.

You can land at any one of the following hubs in London, with Dulles International Airport to Heathrow Airport (IAD-LHR) is by far the most common option on this route: London City Airport (LCY) London Gatwick Airport (LGW) Heathrow Airport (LHR) London Luton Airport (LTN) London Southend Airport (SEN) London Stansted Airport (STN).

The time difference between London and Washington D.C. is 5h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your HopeGoo, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.