American University to Detroit, MI buses and trains from $49

Or, see buses and trains from Detroit, MI to American University.
Here are some trips other travelers have found on Routefriend.
$49
17h 45m
3 stops
Megabus Greyhound
$85
15h 30m
1 stop
Amtrak
$88
19h 25m
3 stops
Amtrak Greyhound