<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by doctall41:
Without renting a car, what's my best bet for getting from BWI to DC, and from DC to Baltimore for an Orioles game and back again?</font>
MARC or Amtrak works for both, depending on the hours of travel. There are cheaper options, like a bus to some stop on the DC metro line outskirts but I know little about that.