There are
898 mi
from Sioux City, IA to Killeen, TX
That's the driving distance. It would take 15 hours 54 mins to go from Sioux City, Iowa to Killeen, Texas.
The flight distance (direct flight from Sioux City, IA to Killeen, TX) is 789.87 mi.
898 mi = 1,444.93 kms