Argosy University-Washington D.C. to University of Bridgeport buses and trains from $39

Here are some trips other travelers have found on Routefriend.
$39
6h 4m
1 stop
GotoBus Metro-North
$42
6h 18m
1 stop
GotoBus Metro-North
$47
7h 16m
1 stop
GotoBus Amtrak