Located just across the Potomac River in Arlington, VA, Ronald Reagan National Airport (DCA) is DC's closet airport (and is metro-accessible).  However, flights tend to be less frequent and more expensive to this airport as it is smaller.

 

 

 

 

 

 

Located in Maryland, Baltimore/Washington International Airport (BWI) is located in Maryland, approxiately 32 miles North of DC.

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Located in Virginia, 26 miles from DC, Dulles International Airport (IAD) is the area's largest airport.