There are
273 mi
from Olathe, KS to Cahokia, IL
That's the driving distance. It would take 5 hours 18 mins to go from Olathe, Kansas to Cahokia, Illinois.
The flight distance (direct flight from Olathe, KS to Cahokia, IL) is 250.41 mi.
273 mi = 438.93 kms