Washington, DC to Stamford, CT buses and trains from $35

Or, see buses and trains from Stamford, CT to Washington, DC.
Here are some trips other travelers have found on Routefriend.
$35
6h 51m
1 stop
Vamoose Metro-North
$37
5h 24m
1 stop
GotoBus Metro-North
$39
5h 46m
1 stop
GotoBus Metro-North
$42
6h 51m
1 stop
GotoBus Metro-North
$53
5h 45m
1 stop
BoltBus Amtrak
$63
3h 39m
1 stop
Amtrak Metro-North
$63
3h 43m
0 stops
Amtrak
$68
4h 36m
1 stop
Amtrak Metro-North
$70
3h 43m
1 stop
Amtrak Amtrak
$?
6h 28m
2 stops
Amtrak Metro-North