There are
2,585 mi
from Vacaville, CA to Johnstown, PA
That's the driving distance. It would take 1 day 21 hours to go from Vacaville, California to Johnstown, Pennsylvania.
The flight distance (direct flight from Vacaville, CA to Johnstown, PA) is 2,282.51 mi.
2,585 mi = 3.22 kms