If you want a cheap flight from Phoenix to Washington DC, you've got one airlines to choose from.
Washington DC Washington Dulles International Airport is just one of the airports in Washington DC. If you're not set on a specific airport, try changing your search from Washington DC Washington Dulles International Airport to Washington DC to see a broader range of flights – they might be cheaper. It usually takes about 9 hrs 55 mins to fly 3144 km to Washington DC Washington Dulles International Airport.
There are about five flights to or via Washington DC every week, so you have plenty of options. Keep your eye out for flights
During this peak season, hotel and holiday prices often increase too, so it's best to book early. Or you could keep your fingers crossed and hold out for a last-minute deal.