There are
2,106 mi
from Walnut Creek, CA to Forest Park, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Forest Park, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Forest Park, IL) is 1,824.02 mi.
2,106 mi = 3,389.98 kms