There are
1,730 mi
from Union City, CA to South Sioux City, NE
That's the driving distance. It would take 1 day 5 hours to go from Union City, California to South Sioux City, Nebraska.
The flight distance (direct flight from Union City, CA to South Sioux City, NE) is 1,391.55 mi.
1,730 mi = 1.61 kms