The Baltimore cruise terminal is 11 miles from BWI Airport, so transportation there and back is easy and fast. That is how far the Baltimore airport is from the cruise port.
Ask your cruise line if they offer transfers for Baltimore cruises. This is transportation between the airport and the cruise terminal. If you buy transfers, you will be met at the airport by their "meet & greet" personnel.
If you prefer not to use your cruise line's transportation services, there are plenty of cabs and shuttles available at the airport.
See our complete calendar of cruises out of Baltimore.