There are
764 mi
from Sioux City, IA to Hereford, TX
That's the driving distance. It would take 14 hours 38 mins to go from Sioux City, Iowa to Hereford, Texas.
The flight distance (direct flight from Sioux City, IA to Hereford, TX) is 621.42 mi.
764 mi = 1,228.88 kms