There are
426 mi
from Sioux City, IA to Duluth, MN
That's the driving distance. It would take 8 hours 21 mins to go from Sioux City, Iowa to Duluth, Minnesota.
The flight distance (direct flight from Sioux City, IA to Duluth, MN) is 363.75 mi.
426 mi = 685.37 kms