There are
566 mi
from Sioux City, IA to Gillette, WY
That's the driving distance. It would take 9 hours 13 mins to go from Sioux City, Iowa to Gillette, Wyoming.
The flight distance (direct flight from Sioux City, IA to Gillette, WY) is 473.13 mi.
566 mi = 910.50 kms