There are
1,798 mi
from Overland Park, KS to Walnut Creek, CA
That's the driving distance. It would take 1 day 6 hours to go from Overland Park, Kansas to Walnut Creek, California.
The flight distance (direct flight from Overland Park, KS to Walnut Creek, CA) is 1,478.71 mi.
1,798 mi = 1.61 kms