Catholic University of America to Western Michigan University buses and trains from $102

Here are some trips other travelers have found on Routefriend.
$102
21h 40m
3 stops
Megabus Greyhound
$106
22h 19m
2 stops
Amtrak
$131
22h 10m
3 stops
Amtrak Greyhound
$147
23h 25m
3 stops
Megabus Amtrak