There are
404 mi
from Waterbury, CT to Niagara Falls, NY
That's the driving distance. It would take 8 hours 15 mins to go from Waterbury, Connecticut to Niagara Falls, New York.
The flight distance (direct flight from Waterbury, CT to Niagara Falls, NY) is 323.63 mi.
404 mi = 650.29 kms