There are
2,105 mi
from Walnut Creek, CA to Lemont, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Lemont, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Lemont, IL) is 1,815.09 mi.
2,105 mi = 3,387.58 kms