There are
2,951 mi
from Fremont, CA to Rockville Centre, NY
That's the driving distance. It would take 2 days 4 hours to go from Fremont, California to Rockville Centre, New York.
The flight distance (direct flight from Fremont, CA to Rockville Centre, NY) is 2,568.47 mi.
2,951 mi = 3.22 kms