There are
495 mi
from Olathe, KS to Sycamore, IL
That's the driving distance. It would take 9 hours 9 mins to go from Olathe, Kansas to Sycamore, Illinois.
The flight distance (direct flight from Olathe, KS to Sycamore, IL) is 387.27 mi.
495 mi = 796.24 kms