By train
Amtrak offers frequent services into Baltimore. The Penn Station is on Charles Street in Midtown—a considerable distance from the harbor area. However, a spur of the light rail system connects to the train station, and you can ride it to the convention center, three blocks from the harbor. Some Amtrak trains also stop at the BWI airport station which is a few miles south of the main Penn Station.
The MARC (http://www.mtamaryland.com/) train system provides inexpensive service between Baltimore and Washington, D.C. and from Washington to Frederick, Maryland and Martinsburg, West Virginia. It is, however, meant to be a commuter system, and runs only during work days/hours Monday - Friday. Check to be sure it is available when you need it. MARC trains operate through the Penn Station designated the "Penn line" on MARC schedules and through a station at Camden Yards the "Camden line", near the Inner Harbor.
By plane
The Baltimore-Washington International Airport IATA: BWI (http://www.bwiairport.com) is located a few miles outside of the city and is accessible by car or light rail. Shuttles connect BWI to an Amtrak train station just off the airport grounds.
There are non-stop flights to BWI from just about every major airport in the country, though some cities may be seasonal or only offer service certain days of the week. A full list can be found here: (http://www.bwiairport.com...).
BWI has a somewhat unique car rental system. Car rental facilities are located in a centralized facility located away from the airport. Airport shuttle buses must take travelers to and from the facility and it is advisable to plan an extra 10 to 15 minutes to get out of the airport. Also, if heading to Washington D.C., the signage from the airport's car rental facility is very poor and confusing, especially to Route 495. However, all roads ultimately lead to highway access in either direction North or South.
By car
Car parking is expensive in the inner city, roughly $5/hr around the harbor area. The I-395 turn-off from I-95 will take you right into the harbor area, but traffic can be slow in the center of the city at rush hour and especially on game days.
By bus
Buses are an affordable way to to get in to Baltimore if you are already in the Eastern Seaboard, especially if you are coming from New York or Philadelphia.
Greyhound
(http://www.greyhound.com/...) serves most major cities in North America, with two stops in Baltimore. One is a few blocks south of the stadium district, near Inner Harbor; another is at the Baltimore Travel Plaza in Southeast Baltimore.Apex Bus
(http://www.apexbus.com/) runs a service from New York. They offer pretty competitive rates for those traveling on a shoestring budget.MVP Bus
(http://www.mvpbus.com/) runs a service between DC and New York. They offer competitive rates, sometimes starting at $1, and stop in the heart of the arts and entertainment district, Station North.BoltBus
(https://www.boltbus.com/) runs a service from New York's 33rd and 7th to Baltimore's Marc Penn Station. From there, the light rail can get you Downtown, the Inner Harbor or elsewhere in town.Megabus
(http://us.megabus.com/) Arrivals and departures are located on the south side of the White Marsh Park & Ride lot, located in the northern suburbs of Baltimore near the intersection of White Marsh Boulevard and Honeygo Boulevard. MTA buses operate between White Marsh Park & Ride and downtown Baltimore. Limited parking is available in the West lot only and must have a sheet of paper with the word "megabus" on the dashboard.