There are
400 mi
from Clarksville, TN to La Grange, IL
That's the driving distance. It would take 8 hours 38 mins to go from Clarksville, Tennessee to La Grange, Illinois.
The flight distance (direct flight from Clarksville, TN to La Grange, IL) is 365.50 mi.
400 mi = 644.17 kms