There are
2,108 mi
from Walnut Creek, CA to Oak Park, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Oak Park, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Oak Park, IL) is 1,825.50 mi.
2,108 mi = 3,393.02 kms