There are
979 mi
from Sioux City, IA to Holladay, UT
That's the driving distance. It would take 17 hours 1 min to go from Sioux City, Iowa to Holladay, Utah.
The flight distance (direct flight from Sioux City, IA to Holladay, UT) is 805.97 mi.
979 mi = 1,575.32 kms