There are
787 mi
from Clarksville, TN to Pasadena, TX
That's the driving distance. It would take 14 hours 36 mins to go from Clarksville, Tennessee to Pasadena, Texas.
The flight distance (direct flight from Clarksville, TN to Pasadena, TX) is 654.97 mi.
787 mi = 1,265.76 kms