Bridgeport, CT to Portland, ME buses and trains from $76

Or, see buses and trains from Portland, ME to Bridgeport, CT.
Here are some trips other travelers have found on Routefriend.
5h 16m
2 stops
Metro-North Amtrak
5h 58m
1 stop
6h 24m
1 stop
Amtrak Megabus
14h 3m
3 stops
Amtrak Amtrak