Duke University to Philadelphia, PA buses and trains from $77

Or, see buses and trains from Philadelphia, PA to Duke University.
Here are some trips other travelers have found on Routefriend.
$77
7h 33m
1 stop
Megabus Amtrak
$82
9h 24m
0 stops
Amtrak
$88
8h 30m
1 stop
Megabus Amtrak
$90
9h 7m
1 stop
Megabus Amtrak
$128
20h 43m
1 stop
Megabus Amtrak