There are
1,857 mi
from Simi Valley, CA to Granite City, IL
That's the driving distance. It would take 1 day 8 hours to go from Simi Valley, California to Granite City, Illinois.
The flight distance (direct flight from Simi Valley, CA to Granite City, IL) is 1,612.91 mi.
1,857 mi = 1.61 kms