There are
1,992 mi
from Markham, IL to Walnut, CA
That's the driving distance. It would take 1 day 10 hours to go from Markham, Illinois to Walnut, California.
The flight distance (direct flight from Markham, IL to Walnut, CA) is 1,717.94 mi.
1,992 mi = 3,205.90 kms