There are
662 mi
from Rockford, IL to Chattanooga, TN
That's the driving distance. It would take 12 hours 27 mins to go from Rockford, Illinois to Chattanooga, Tennessee.
The flight distance (direct flight from Rockford, IL to Chattanooga, TN) is 539.22 mi.
662 mi = 1,065.33 kms