All airports are serviced by Super Shuttle and Taxi Cabs. DCA: Reagan Washington National (20 miles.)
It is easiest to take the Metro. Take the Yellow Line Towards Mt. Vernon, switch to the Red Line at Gallery Pl-Chinatown towards Shady Grove and exit at the White Flint station. IAD: Dulles International (25 miles)
Take the Shuttle to the Metro. Take the Orange Line to Metro Center and switch to the Red Line towards Shady Grove and exit at the White Flint station.
BWI: Baltimore/Washington International (35 miles)
You can connect to Amtrak and Marc Trains from the airport. Take the rail to the Washington DC Union Station and continue on the Metro Red Line towards Shady Grove, exit at the White Flint station.