There are
1,725 mi
from Norwalk, CA to Watertown, SD
That's the driving distance. It would take 1 day 6 hours to go from Norwalk, California to Watertown, South Dakota.
The flight distance (direct flight from Norwalk, CA to Watertown, SD) is 1,346.52 mi.
1,725 mi = 1.61 kms