There are
762 mi
from Hereford, TX to Sioux City, IA
That's the driving distance. It would take 14 hours 37 mins to go from Hereford, Texas to Sioux City, Iowa.
The flight distance (direct flight from Hereford, TX to Sioux City, IA) is 621.42 mi.
762 mi = 1,226.01 kms