There are
641 mi
from Rowlett, TX to Clarksville, TN
That's the driving distance. It would take 11 hours 35 mins to go from Rowlett, Texas to Clarksville, Tennessee.
The flight distance (direct flight from Rowlett, TX to Clarksville, TN) is 579.35 mi.
641 mi = 1,031.57 kms