There are
1,853 mi
from Simi Valley, CA to Cahokia, IL
That's the driving distance. It would take 1 day 8 hours to go from Simi Valley, California to Cahokia, Illinois.
The flight distance (direct flight from Simi Valley, CA to Cahokia, IL) is 1,610.38 mi.
1,853 mi = 1.61 kms