There are
908 mi
from Cheyenne, WY to Sycamore, IL
That's the driving distance. It would take 15 hours 55 mins to go from Cheyenne, Wyoming to Sycamore, Illinois.
The flight distance (direct flight from Cheyenne, WY to Sycamore, IL) is 834.85 mi.
908 mi = 1,461.51 kms