United Airlines offers roundtrip flights to Washington, D.C. from select cities in the U.S. for as low as $128, as provided by ShermansTravel. (Click on "United.com" in the main paragraph to see this sale; all taxes are included.) That's tied with our mention from three weeks ago as the lowest base rate we could find for United fares to Washington, D.C. It's also a current low for select routes by $15. This price is valid on flights departing from Boston, MA, (BOS) to Washington, D.C. (IAD) on May 14; prices vary depending on the travel cities and dates chosen. Blackout dates may apply. Book this travel deal by April 15 for travel May 1 through June 30. Other notable fares:
Tampa (TPA) to Washington, D.C. (IAD) from $168
Newark (EWR) to Washington, D.C. (IAD) from $168
Chicago (ORD) to Washington, D.C. (IAD) from $218
see all available United fares to Washington, D.C.