There are
1,535 mi
from Mt Vernon, WA to Sioux Falls, SD
That's the driving distance. It would take 1 day 2 hours to go from Mt Vernon, Washington to Sioux Falls, South Dakota.
The flight distance (direct flight from Mt Vernon, WA to Sioux Falls, SD) is 1,269.16 mi.
1,535 mi = 2,470.27 kms