There are
408 mi
from Clarksville, TN to Elmhurst, IL
That's the driving distance. It would take 8 hours 45 mins to go from Clarksville, Tennessee to Elmhurst, Illinois.
The flight distance (direct flight from Clarksville, TN to Elmhurst, IL) is 372.31 mi.
408 mi = 656.14 kms