There are
2,592 mi
from San Diego, CA to Niagara Falls, NY

That's the driving distance. It would take 1 day 22 hours to go from San Diego, California to Niagara Falls, New York.

The flight distance (direct flight from San Diego, CA to Niagara Falls, NY) is 2,176.72 mi.

2,592 mi = 3.22 kms