There are
927 mi
from Sioux City, IA to Ammon, ID
That's the driving distance. It would take 18 hours 33 mins to go from Sioux City, Iowa to Ammon, Idaho.
The flight distance (direct flight from Sioux City, IA to Ammon, ID) is 788.49 mi.
927 mi = 1,491.94 kms