There are
2,097 mi
from Walnut Creek, CA to Cary, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Cary, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Cary, IL) is 1,801.31 mi.
2,097 mi = 3,374.98 kms