There are
477 mi
from Overland Park, KS to Dekalb, IL
That's the driving distance. It would take 8 hours 48 mins to go from Overland Park, Kansas to Dekalb, Illinois.
The flight distance (direct flight from Overland Park, KS to Dekalb, IL) is 371.81 mi.
477 mi = 767.32 kms