Cheap Flights from Memphis Intl. to Ronald Reagan Washington National. Prices and availability are subject to change. The cheapest month to fly is February. According to our data, this flight is not scheduled to fly on this date. Can I catch a flight from Memphis, TN (MEM-Memphis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) right now? This is the average in-air flight time (wheels up to wheels down on the runway) based on actual flights taken over the past year. How many direct flights are available from MEM to WAS? C. (DCA) Flights from Memphis (MEM) to Washington, D. Modifying this information may result in a different fare. Find the best price before you book your trip to Washington, D.