There are
1,943 mi
from Simi Valley, CA to Chatham, IL
That's the driving distance. It would take 1 day 10 hours to go from Simi Valley, California to Chatham, Illinois.
The flight distance (direct flight from Simi Valley, CA to Chatham, IL) is 1,640.19 mi.
1,943 mi = 1.61 kms