There are
1,088 mi
from Missoula, MT to South Sioux City, NE
That's the driving distance. It would take 18 hours 19 mins to go from Missoula, Montana to South Sioux City, Nebraska.
The flight distance (direct flight from Missoula, MT to South Sioux City, NE) is 914.64 mi.
1,088 mi = 1.61 kms