There are
1,658 mi
from Walnut Creek, CA to Yankton, SD
That's the driving distance. It would take 1 day 4 hours to go from Walnut Creek, California to Yankton, South Dakota.
The flight distance (direct flight from Walnut Creek, CA to Yankton, SD) is 1,337.36 mi.
1,658 mi = 2,668.95 kms