There are
2,099 mi
from Walnut Creek, CA to Lombard, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Lombard, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Lombard, IL) is 1,814.04 mi.
2,099 mi = 3,377.67 kms