There are
300 mi
from Dubuque, IA to Sioux City, IA
That's the driving distance. It would take 5 hours 57 mins to go from Dubuque, Iowa to Sioux City, Iowa.
The flight distance (direct flight from Dubuque, IA to Sioux City, IA) is 292.12 mi.
300 mi = 483.38 kms