There are
875 mi
from Cheyenne, WY to Chatham, IL
That's the driving distance. It would take 15 hours 34 mins to go from Cheyenne, Wyoming to Chatham, Illinois.
The flight distance (direct flight from Cheyenne, WY to Chatham, IL) is 800.61 mi.
875 mi = 1,407.96 kms