Philadelphia, PA to Dover, DE buses and trains from $38

Or, see buses and trains from Dover, DE to Philadelphia, PA.
Here are some trips other travelers have found on Routefriend.
$38
2h 16m
1 stop
Amtrak
$47
4h 49m
2 stops
NJTransit Amtrak
$157
7h 25m
2 stops
Amtrak Amtrak