There are
652 mi
from Clarksville, TN to Garland, TX
That's the driving distance. It would take 11 hours 50 mins to go from Clarksville, Tennessee to Garland, Texas.
The flight distance (direct flight from Clarksville, TN to Garland, TX) is 582.88 mi.
652 mi = 1,048.50 kms