Chattanooga, TN to Birmingham, AL buses and trains from $15

Here are some trips other travelers have found on Routefriend.
$15
5h 50m
1 stop
Megabus Greyhound
$39
7h 20m
1 stop
Megabus Greyhound
$45
9h 5m
1 stop
Megabus Amtrak
$73
11h 45m
2 stops
Megabus Greyhound