There are
827 mi
from Sioux City, IA to Las Vegas, NM
That's the driving distance. It would take 16 hours 14 mins to go from Sioux City, Iowa to Las Vegas, New Mexico.
The flight distance (direct flight from Sioux City, IA to Las Vegas, NM) is 671.48 mi.
827 mi = 1,331.39 kms