You're no doubt eager to know some more about Baltimore, MD Airport (BWI-Baltimore Washington Intl. Thurgood Marshall). We can fill you in on the essentials before you pick up the keys to your rental car.Once you've collected your bags from the arrivals hall of Baltimore, MD Airport (BWI-Baltimore Washington Intl. Thurgood Marshall), jump behind the wheel of your rental car and head into Washington. The downtown area is situated 28 miles to the southwest of the airport.