There are
490 mi
from Rockford, IL to Leavenworth, KS
That's the driving distance. It would take 9 hours 11 mins to go from Rockford, Illinois to Leavenworth, Kansas.
The flight distance (direct flight from Rockford, IL to Leavenworth, KS) is 366.99 mi.
490 mi = 788.67 kms