There are
435 mi
from Sioux City, IA to Watertown, WI
That's the driving distance. It would take 8 hours 39 mins to go from Sioux City, Iowa to Watertown, Wisconsin.
The flight distance (direct flight from Sioux City, IA to Watertown, WI) is 391.42 mi.
435 mi = 700.48 kms