There are
2,088 mi
from Walnut Creek, CA to Naperville, IL
That's the driving distance. It would take 1 day 11 hours to go from Walnut Creek, California to Naperville, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Naperville, IL) is 1,807.18 mi.
2,088 mi = 3,360.33 kms