There are
1,781 mi
from Walnut Creek, CA to Watertown, SD
That's the driving distance. It would take 1 day 6 hours to go from Walnut Creek, California to Watertown, South Dakota.
The flight distance (direct flight from Walnut Creek, CA to Watertown, SD) is 1,373.62 mi.
1,781 mi = 2,866.91 kms