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

Or, see buses and trains from Philadelphia, PA to Dover, DE.
Here are some trips other travelers have found on Routefriend.
$38
2h 6m
1 stop
Amtrak
$75
3h 46m
2 stops
Amtrak NJTransit
$?
6h 31m
2 stops
Amtrak Amtrak