There are
2,071 mi
from Walnut Creek, CA to Rockford, IL
That's the driving distance. It would take 1 day 11 hours to go from Walnut Creek, California to Rockford, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Rockford, IL) is 1,757.43 mi.
2,071 mi = 3,333.09 kms