There are
2,012 mi
from Vacaville, CA to Cahokia, IL
That's the driving distance. It would take 1 day 10 hours to go from Vacaville, California to Cahokia, Illinois.
The flight distance (direct flight from Vacaville, CA to Cahokia, IL) is 1,711.64 mi.
2,012 mi = 3.22 kms