If you want a cheap flight from Cardiff to Washington DC, you've got one airlines to choose from. You can use the search box to filter your preferences, but we've found that the cheapest day to fly is 03 / Mar / 2025.
Make sure you use the search options above to search for flights to other airports in Washington DC, not just Washington DC Ronald Reagan Washington National Airport. The more options you look at, the better your chance of finding a cheap deal. Just so you know, the flight typically takes 17 hrs 10 mins.
There are about ten flights to or via Washington DC every week, so you have plenty of options. Keep your eye out for flights
If you're planning on going to Washington DC during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.
