Public Bus
MTA Bus (Maryland Transportation Administration) number 17 runs between BWI, Parkway Center, Arundel Mills Mall, Airport 100 Park, and the Patapsco Light Rail stop. Bus number 99 runs to the Old Court Metro Subway Station.
Location: Main Terminal, before security, lower level, outside Door 1 and Door 18
Cost: USD 1.80 one-way
Operating hours: 24 hours daily (#17) and 06:00-18:00 weekdays (#99).
Express Bus
The Washington Metropolitan Area Transit Authority (WMTA) BWI Express/B30 runs to the Greenbelt Metro Station every hour during operating hours.
Location:
Main Terminal, before security, International Concourse, lower level
Main Terminal, before security, Concourse A/B, lower level
Cost: USD 7 one-way
Operating hours: 06:30 -21:33 Mon-Fri
Light Rail
Light Rail service is available from BWI Marshall Rail Station. Trains go to downtown Baltimore as well as Penn Station (exit at Mt. Royal and take the Penn Station Light Rail). Shuttle stops to the BWI Marshall Rail station are available on the lower level terminal roadway between door numbers 1&2, 8&9, 14&15, and 17&18. They operate every 6 minutes from 05:00-20:00, every 8 minutes from 20:00-01:00, and every 25 minutes from 01:00-05:00.
Location: Main Terminal, before security, lower level, adjacent to Concourse E
Cost: USD 1.60 one-way
Operating hours: 05:00-23:00 Mon-Fri, 06:00-23:00 Sat, 11:00-19:00 Sun and Holidays
Taxi
Marshall taxicabs are prohibited from charging flat rates.
Location: Main Terminal, before security, lower level, outside the baggage claim area
Cost: approximately USD 35 to Baltimore Inner Harbor