There are
496 mi
from West Allis, WI to Sioux Falls, SD
That's the driving distance. It would take 8 hours 57 mins to go from West Allis, Wisconsin to Sioux Falls, South Dakota.
The flight distance (direct flight from West Allis, WI to Sioux Falls, SD) is 438.60 mi.
496 mi = 798.60 kms