Flint, MI to Milwaukee, WI buses and trains from $63

Or, see buses and trains from Milwaukee, WI to Flint, MI.
Here are some trips other travelers have found on Routefriend.
$63
8h 1m
1 stop
Amtrak
$69
8h 28m
2 stops
Amtrak Greyhound
$80
16h 37m
4 stops
Amtrak Greyhound