There are
751 mi
from Mckinney, TX to South Sioux City, NE
That's the driving distance. It would take 13 hours 27 mins to go from Mckinney, Texas to South Sioux City, Nebraska.
The flight distance (direct flight from Mckinney, TX to South Sioux City, NE) is 640.53 mi.
751 mi = 1,208.32 kms