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Flight
DC has 2 major airports that fly all across the country. National (DCA) is about 15-20 minutes from Georgetown by car, and Dulles (IAD) is 30 minutes to 1 hour depending on traffic. Both airports are connected to the DC metro, although Georgetown (sadly) isn't on Metro, so you'll either need to drive, take a taxi/Uber, or walk from the Rosslyn or Foggy Bottom stops. BWI airport is another option, although it is about 1 hour or more by car from DC and is not connected by Metro (although you can take the MARC train from BWI to DC's Union Station and transfer to the Metro there). If you are coordinating travel plans with others, make sure you end up at the same airport!