There are
2,082 mi
from Vacaville, CA to Prospect Heights, IL
That's the driving distance. It would take 1 day 11 hours to go from Vacaville, California to Prospect Heights, Illinois.
The flight distance (direct flight from Vacaville, CA to Prospect Heights, IL) is 1,802.62 mi.
2,082 mi = 3.22 kms