There are
2,331 mi
from Vacaville, CA to Fremont, OH
That's the driving distance. It would take 1 day 16 hours to go from Vacaville, California to Fremont, Ohio.
The flight distance (direct flight from Vacaville, CA to Fremont, OH) is 2,054.60 mi.
2,331 mi = 3.22 kms