With Netflights, you can compare lots of flights to Washington DC in USA. It's free and easy. We've gone through the 506 weekly flights connecting London and Washington DC, operated by 16 airlines – so you can see all your options before you book.
There are actually two airports in Washington DC. We've scanned all of the flights into Washington DC and, on average, the cheapest airport to fly into is Washington DC Ronald Reagan Washington National Airport (DCA). Look out for flights with TAP Air Portugal too, as they tend to have the cheapest prices.
The cheapest airport to fly from is London Heathrow, but we recommend booking in advance to get a good price.
On average, the 5936 km flight from London to Washington DC takes 11 hrs. If you're landing late, why not take a look at hotels near the airport? We've got a range of accommodation and car hire options across USA.