Miles between Sioux City, IA and Duncan, OK

There are
634 mi
from Sioux City, IA to Duncan, OK

That's the driving distance. It would take 11 hours 30 mins to go from Sioux City, Iowa to Duncan, Oklahoma.

The flight distance (direct flight from Sioux City, IA to Duncan, OK) is 558.94 mi.

634 mi = 1,020.45 kms