There are
2,309 mi
from Vacaville, CA to Dayton, OH
That's the driving distance. It would take 1 day 16 hours to go from Vacaville, California to Dayton, Ohio.
The flight distance (direct flight from Vacaville, CA to Dayton, OH) is 2,015.07 mi.
2,309 mi = 3.22 kms