There are
1,670 mi
from Sioux Falls, SD to Lake Forest, CA
That's the driving distance. It would take 1 day 5 hours to go from Sioux Falls, South Dakota to Lake Forest, California.
The flight distance (direct flight from Sioux Falls, SD to Lake Forest, CA) is 1,318.23 mi.
1,670 mi = 1.61 kms