There are
1,405 mi
from Norwalk, CT to Sioux Falls, SD
That's the driving distance. It would take 1 day 2 hours to go from Norwalk, Connecticut to Sioux Falls, South Dakota.
The flight distance (direct flight from Norwalk, CT to Sioux Falls, SD) is 1,197.48 mi.
1,405 mi = 1.61 kms