There are
1,601 mi
from Downey, CA to Sioux City, IA
That's the driving distance. It would take 1 day 4 hours to go from Downey, California to Sioux City, Iowa.
The flight distance (direct flight from Downey, CA to Sioux City, IA) is 1,314.40 mi.
1,601 mi = 1.61 kms