There are
2,048 mi
from Vacaville, CA to Oswego, IL
That's the driving distance. It would take 1 day 11 hours to go from Vacaville, California to Oswego, Illinois.
The flight distance (direct flight from Vacaville, CA to Oswego, IL) is 1,783.14 mi.
2,048 mi = 3.22 kms