Frankfort, IN to Northwestern University buses and trains from $22

Or, see buses and trains from Northwestern University to Frankfort, IN.
Here are some trips other travelers have found on Routefriend.
3h 31m
0 stops
6h 54m
1 stop
9h 46m
3 stops
Greyhound Amtrak
7h 46m
2 stops
Greyhound Amtrak