Three major airports serve the Washington, DC, area:

Greyhound and Peter Pan operate buses to cities across the country, including service nearly every hour to New York.

 

Amtrak operates a number of trains out of the DC area.  The District's primary train station is Union Station, which is accessible by Metrorail and Metrobus. MARC Train provides inexpensive service to points in Maryland and West Virginia; Virginia Railway Express runs to points in Virginia.