There are
409 mi
from Sioux City, IA to Belvidere, IL
That's the driving distance. It would take 8 hours 25 mins to go from Sioux City, Iowa to Belvidere, Illinois.
The flight distance (direct flight from Sioux City, IA to Belvidere, IL) is 385.85 mi.
409 mi = 658.27 kms