There are
410 mi
from Champaign, IL to Leavenworth, KS
That's the driving distance. It would take 7 hours 49 mins to go from Champaign, Illinois to Leavenworth, Kansas.
The flight distance (direct flight from Champaign, IL to Leavenworth, KS) is 359.24 mi.
410 mi = 660.38 kms