Fly into Baltimore Washington International Airport (BWI), the closest airport, located 9.3 mi (14.9 km) from the city centre. If you're unable to find a flight that fits your schedule, you can also fly into Baltimore, MD (MTN-Martin State), which is 11.9 mi (19.2 km) away.
You might consider catching a ride on the metro at Penn-North Metro Station for ease of access to the rest of the city.