Ronald Reagan Washington National Airport (DCA)
A taxi will take about 30 minutes and will cost $45-55 each way
Washington Dulles International Airport (IAD)
A taxi will take about 45 minutes and will cost $65-75 each way
Baltimore/Washington International Thurgood Marshall Airport (BWI)
A taxi will take about 1 hour and will cost $90-100 each way
Metro:
Bethesda Metro Station (Red Line) is the nearest metro stop located right beneath Hyatt Regency Bethesda
Union Station, Washington, DC
A taxi will take about 40 minutes and will cost $55-70 each way
Note: Both Uber and Lyft also operate in the area and may be significantly less expensive than taxis.