There are
2,653 mi
from Hayward, CA to Niagara Falls, NY
That's the driving distance. It would take 1 day 22 hours to go from Hayward, California to Niagara Falls, New York.
The flight distance (direct flight from Hayward, CA to Niagara Falls, NY) is 2,270.83 mi.
2,653 mi = 3.22 kms