There are
383 mi
from Danbury, CT to Niagara Falls, NY
That's the driving distance. It would take 8 hours 9 mins to go from Danbury, Connecticut to Niagara Falls, New York.
The flight distance (direct flight from Danbury, CT to Niagara Falls, NY) is 308.76 mi.
383 mi = 615.65 kms