There are
2,095 mi
from Walnut Creek, CA to Carol Stream, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Carol Stream, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Carol Stream, IL) is 1,807.41 mi.
2,095 mi = 3,371.05 kms