Columbia University in the City of New York to Portland, ME buses and trains from $93

Here are some trips other travelers have found on Routefriend.
$93
6h 25m
2 stops
Metro-North Amtrak
$97
7h 52m
2 stops
Metro-North Amtrak
$98
6h 25m
2 stops
Metro-North Amtrak
$127
7h 22m
2 stops
Metro-North Amtrak
$136
9h 55m
4 stops
Metro-North Amtrak