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Cheap flights from Washington, D.C. to London Heathrow

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      Compare Washington, D.C. to London Heathrow flight deals

      Find the cheapest month or even day of the year to fly to London Heathrow

      Book the best London Heathrow fare with no extra fees

      Flight deals from Washington, D.C. to London Heathrow

      Looking for a cheap last-minute deal or the best round-trip flight from Washington, D.C. to London Heathrow? Find the lowest prices on one-way and round-trip tickets right here.
      London.C$581 per passenger.Departing Tue, Oct 28, returning Thu, Nov 6.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Tue, Oct 28, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Thu, Nov 6, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.
      London.C$581 per passenger.Departing Mon, Dec 1, returning Mon, Dec 8.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Mon, Dec 1, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Mon, Dec 8, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.
      London.C$581 per passenger.Departing Sun, Sep 7, returning Mon, Sep 15.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Sun, Sep 7, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Mon, Sep 15, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.
      London.C$581 per passenger.Departing Mon, Aug 18, returning Wed, Aug 27.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Mon, Aug 18, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Wed, Aug 27, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.
      London.C$581 per passenger.Departing Sun, Mar 22, returning Tue, Mar 31.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Sun, Mar 22, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Tue, Mar 31, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.
      London.C$581 per passenger.Departing Mon, Aug 11, returning Tue, Sep 2.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Mon, Aug 11, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Tue, Sep 2, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.
      London.C$581 per passenger.Departing Tue, Nov 4, returning Thu, Nov 20.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Tue, Nov 4, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Thu, Nov 20, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.
      London.C$581 per passenger.Departing Thu, Oct 16, returning Mon, Oct 20.Round-trip flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Thu, Oct 16, arriving in London Heathrow.Inbound indirect flight with TAP Air Portugal, departing from London Heathrow on Mon, Oct 20, arriving in Washington Dulles.Price includes taxes and charges.From C$581, select.

      Find the cheapest month to fly from Washington, D.C. to London Heathrow

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington, D.C. to London Heathrow flights are currently cheapest in August.
      Jul
      from C$1,041
      Aug
      from C$581
      Sep
      from C$581
      Oct
      from C$581
      Nov
      from C$581
      Dec
      from C$581
      Jan
      from C$581
      Feb
      from C$582
      Mar
      from C$581
      Apr
      from C$779
      May
      from C$799
      Jun
      from C$1,045

      Direct flights from Washington, D.C. to London Heathrow

      Washington, D.C. to London Heathrow: Alternative routes

      Compare routes from Washington, D.C. to London below. You may find an airport to fly into that's cheaper, faster, or easier than London Heathrow.

      Washington, D.C. to London: Flight information

      The things to know before you go.
      Cheapest flight foundC$581
      Cheapest month to flyOctober
      Average flight time7 hrs, 19 mins
      Most popular airlineAmerican Airlines
      Average flights per week219

      Finding cheap flights from Washington, D.C. to London Heathrow: Frequently asked questions

      The best price we found for a round-trip flight from Washington, D.C. to London Heathrow is C$581. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      7 hours and 18 minutes is the average flight time from Washington, D.C. to London Heathrow.
      American Airlines, British Airways and Aer Lingus fly direct from Washington, D.C. to London Heathrow.
      There are 657 flights per week flying from Washington, D.C. to London Heathrow, as of July 2025.
      The cheapest month to fly from Washington, D.C. to London Heathrow is usually October.
      After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Washington, D.C. to London Heathrow Airport on Thursday, October 16, 2025.
      Yes – the average flight time is 7 hours and 18 minutes.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to London Heathrow but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
      We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to London is around 40 days in advance, so don’t leave your flight to the last minute.

      Flying from Washington DC to London Heathrow Airport (LHR): What you need to know

      • When planning your flight from Washington DC to London Heathrow Airport (LHR), there's a good range of airports you can fly out of. Ronald Reagan National Airport (DCA), Washington Dulles International Airport (IAD) and Baltimore/Wash International Thurgood Marshall Airport (BWI) are Washington DC's main terminals.

      • The timezone in London is UTC+0, which is four hours ahead of Washington DC. London Heathrow Airport is located in London.

      • To ensure you get on your flight from Washington DC to LHR, leave enough time to check in and find your gate. Turning up two hours ahead of international departures and an hour before domestic flights is the general rule.

      • With more people on the move during high season, it's wise to get to your terminal earlier than usual. Two hours for domestic flights and up to four for international journeys will help you deal with any delays.

      Airports in Washington DC

      Ronald Reagan National Airport (DCA)

      • A stopover is the perfect opportunity to take a travel break and possibly even explore another city. When searching for cheap flights from Washington DC to LHR departing from Ronald Reagan National Airport (DCA), deselect the 'Direct flights only' box to discover where you can stop along the way. Popular options include:

        • John F. Kennedy International Airport (JFK)

        • Newark Liberty International Airport (EWR)

        • Logan International Airport (BOS)

      • Located around 8 kilometres from central Washington DC, DCA can be reached in about 15 minutes by car, depending on traffic. The journey on public transport is roughly 45 minutes.

      • Catching an early flight from Washington DC to London Heathrow Airport? Avoid the last-minute rush to the terminal (and get some bonus sleep) by staying at one of these hotels close to Ronald Reagan National Airport:

      • When it comes to Ronald Reagan National Airport's on-time performance, 76.44% of flights complete their journey on time.

      • The address for DCA is 1 Aviation Circle.

      Washington Dulles International Airport (IAD)

      • You can book a direct Washington DC to London Heathrow Airport (LHR) flight ticket out of Washington Dulles International Airport (IAD). Decide if leaving from IAD is a better fit for your trip.

      • When departing from IAD, you can pick from a variety of airlines that operate direct flights from Washington DC to LHR. Cruise at 30,000 feet with these leading carriers:

      • British Airways ranks number one in bookings on the IAD to LHR route.

      • Virgin Atlantic has the strongest on-time record of any carrier operating flights between Washington Dulles International Airport and London Heathrow Airport.

      • Tick a new place off your list or just take some time to unwind with a stopover. If you'd like to break up your flight from Washington DC to London Heathrow Airport, here's where you can stop when setting off from Washington Dulles International Airport:

        • Newark Liberty International Airport (EWR)

        • Logan International Airport (BOS)

        • Dublin Airport (DUB)

      • You can reach IAD from the centre of Washington DC in about 50 minutes by car (depending on traffic conditions). The ride on public transport will take roughly 1 hour 10 minutes to travel the 56 kilometres or so.

      • Catching the earliest flight? You might like to check in to one of these accommodation options near Washington Dulles International Airport the day before your Washington DC to LHR flight:

      • Washington Dulles International Airport has an on-time performance rate of 74.39%. This figure highlights how often flights that take off from this airport arrive on time.

      • You'll find IAD at 1 Saarinen Circle.

      Baltimore/Wash International Thurgood Marshall Airport (BWI)

      • Begin your journey at Baltimore/Wash International Thurgood Marshall Airport (BWI) and go straight to your destination without any stops. You can book direct flights from Washington DC to London Heathrow Airport from here.

      • Prepare for takeoff with British Airways. It offers direct Washington DC to LHR flight tickets from BWI.

      • British Airways sees the most traveller bookings for flights from BWI to LHR.

      • The carrier with the top on-time arrival performance on this route is British Airways.

      • Book a flight ticket from Washington DC to London Heathrow Airport (LHR) out of Baltimore/Wash International Thurgood Marshall Airport (BWI) with a stop or two. Popular stopovers between BWI and LHR are:

        • John F. Kennedy International Airport (JFK)

        • Logan International Airport (BOS)

        • Raleigh-Durham International Airport (RDU)

      • BWI is roughly 48 kilometres from central Washington DC. Driving from the city centre to the terminal takes about 50 minutes. If you're thinking about using public transport, expect a journey of around 1 hour 30 minutes.

      • Skip the rush on your departure day — stay close to Baltimore/Wash International Thurgood Marshall Airport and know you'll be at your gate with time to spare. Settle in at one of these hotels the day before if you've booked an early Washington DC to London Heathrow Airport flight:

      • The on-time performance record of BWI is 77.13%. In simpler terms, that's how frequently flights that depart this airport arrive at their final stop as planned.

      About London Heathrow Airport (LHR)

      Getting from London Heathrow Airport (LHR) to central London

      • Central London is about 26 kilometres from London Heathrow Airport. Journey times by cab or car rental will vary depending on traffic conditions, so do a little research ahead of your trip.

      • It takes around 1 hour if you're travelling on public transport.

      How to find the cheapest flights from Washington DC to London Heathrow Airport (LHR)

      • Right now, C$301 is the lowest price we've found for a one-way ticket from Washington DC to London Heathrow Airport. The cheapest price for a return flight is C$581. Remember fares can change due to availability at the time of booking.

      • Lock in cheap flights from Washington DC to LHR by booking two months ahead. Based on our research, that's the sweet spot for finding a bargain.

      • The best month for finding cheap Washington DC to London Heathrow Airport tickets is July. Use the 'Whole month' tool to compare prices, then select the dates offering the lowest fares.

      • You don't need to check back in every day to find out if prices have dropped when you set up a Price Alert. We'll let you know the moment a better deal comes up on flight tickets from Washington DC to LHR.

      • Filters make it easier to track down a bargain for your flight from Washington DC to London Heathrow Airport. Pick the departure times, carriers and stops that line up with your plans. Then sort the results by 'Cheapest' to find the lowest price right away.

      The best time to fly from Washington DC to London Heathrow Airport (LHR)

      • It's time to figure out your travel dates for your flight from Washington DC to London Heathrow Airport (LHR). July is the peak month for travel to London. If you like your getaways a little more chill, go in February.

      • When booking your Washington DC to LHR flight ticket, consider the type of weather you enjoy. July is the warmest month in London, with temperatures ranging from 11ºC (52ºF) to 26ºC (79ºF).

      • If you like travelling in cooler conditions, look for a cheap ticket from Washington DC to London Heathrow Airport in January when temperatures are between 0ºC (32ºF) and 9ºC (48ºF).

      More about London

      • Start your London trip off on the right foot by choosing the ideal place to stay. Once you've booked your flight from Washington DC to London Heathrow Airport, check out our selection of hotels including:

      • Your visit to London should come with a side of sightseeing. Attractions that are worth your time include The British Museum, Westminster Abbey and Big Ben.

      Explore more of the United Kingdom

      • London has plenty to offer, but there are so many other corners of the United Kingdom you should also see. About 153 kilometres north-west of London, a trip to Birmingham will keep you busy. Start with attractions like The Windsor Castle, Birmingham Museum & Art Gallery and Birmingham Hippodrome Theatre.

      • If you want to check out another major stop in the United Kingdom, consider Bristol, about 145 kilometres west of London. Banksey, Banksy's You Don't Need Planning Permission to Build Castles in the Sky and Clifton Suspension Bridge are among the biggest draws.

      Plan the rest of your trip from Washington, D.C. to London

      Prices shown on this page are estimated lowest prices only. Found in the last 45 days.