There are
429 mi
from Olathe, KS to Rantoul, IL
That's the driving distance. It would take 8 hours 6 mins to go from Olathe, Kansas to Rantoul, Illinois.
The flight distance (direct flight from Olathe, KS to Rantoul, IL) is 368.10 mi.
429 mi = 690.46 kms