There are
2,036 mi
from Simi Valley, CA to Riverdale, IL
That's the driving distance. It would take 1 day 11 hours to go from Simi Valley, California to Riverdale, Illinois.
The flight distance (direct flight from Simi Valley, CA to Riverdale, IL) is 1,760.76 mi.
2,036 mi = 3.22 kms