There are
1,664 mi
from Sioux City, IA to Vacaville, CA
That's the driving distance. It would take 1 day 4 hours to go from Sioux City, Iowa to Vacaville, California.
The flight distance (direct flight from Sioux City, IA to Vacaville, CA) is 1,370.34 mi.
1,664 mi = 1.61 kms