We've scanned every flight from Pittsburgh to Washington DC to find the best deals. If you want a cheap flight, it's best to be as flexible as you can on dates. If that day's no good for you, try searching by month to see some alternative dates.
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.
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.