There are
1,577 mi
from Simi Valley, CA to Yankton, SD
That's the driving distance. It would take 1 day 4 hours to go from Simi Valley, California to Yankton, South Dakota.
The flight distance (direct flight from Simi Valley, CA to Yankton, SD) is 1,293.92 mi.
1,577 mi = 1.61 kms