There are
1,600 mi
from Overland Park, KS to Walnut, CA
That's the driving distance. It would take 1 day 3 hours to go from Overland Park, Kansas to Walnut, California.
The flight distance (direct flight from Overland Park, KS to Walnut, CA) is 1,328.98 mi.
1,600 mi = 1.61 kms