Washington, DC to New Haven, CT buses and trains from $43

Or, see buses and trains from New Haven, CT to Washington, DC.
Here are some trips other travelers have found on Routefriend.
$43
6h 31m
1 stop
GotoBus Metro-North
$43
9h 22m
1 stop
GotoBus Metro-North
$46
6h 43m
1 stop
GotoBus Metro-North
$54
7h 39m
1 stop
GotoBus Amtrak
$63
4h 24m
0 stops
Amtrak
$70
5h 49m
1 stop
Amtrak Metro-North
$71
5h 48m
1 stop
Amtrak Metro-North
$97
6h 48m
1 stop
Amtrak Metro-North
$97
7h 22m
1 stop
Amtrak Metro-North
$106
6h 15m
1 stop
Amtrak Metro-North
$123
4h 24m
1 stop
Amtrak Amtrak