There are
519 mi
from Sioux City, IA to Florissant, MO
That's the driving distance. It would take 9 hours 41 mins to go from Sioux City, Iowa to Florissant, Missouri.
The flight distance (direct flight from Sioux City, IA to Florissant, MO) is 408.79 mi.
519 mi = 835.78 kms