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Cheap Flights from Washington DC to London (IAD, BWI to LON)

For nonstop London service, Dulles is the key Washington-area airport. BWI can still be worth comparing; DCA generally requires a connection for this long-haul trip.

Airport choice matters before you even compare fares. A cheaper ticket from a farther airport can lose its advantage in ground travel and time.
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IAD / BWI to LHR / LGW

United Kingdom · London

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More Europe fares from Washington DC

Compare major European gateways from the Washington area.

IAD is the main long-haul airportDulles is designed for international service and is usually the first airport to check for a London nonstop.
DCA usually means a connectionReagan National’s operating rules make it a poor fit for nonstop long-haul London service.
London airport matters tooHeathrow and Gatwick have different ground transport, so compare the full airport pair if an itinerary uses LGW.

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Washington DC to London FAQs

IAD is usually the main choice for nonstop long-haul service. BWI can be worth comparing, while DCA generally requires a connection.

Yes. Nonstop service is available from the Washington area, especially from Dulles. Search your dates for the current schedule.

Yes if both appear on your dates. Heathrow generally has broader long-haul service, while Gatwick may suit some itineraries.

The UK uses pounds sterling (GBP). The Trip Snapshot can show a USD-to-GBP reference rate.

A nonstop can save hours and reduce connection risk on an overnight transatlantic trip.

Compare airport, total travel time, baggage, seat fees, arrival time and final booking price.

No. They use recent fare observations and the booking provider confirms current availability.