There are
965 mi
from Pasadena, TX to Clarksville, IN
That's the driving distance. It would take 17 hours 34 mins to go from Pasadena, Texas to Clarksville, Indiana.
The flight distance (direct flight from Pasadena, TX to Clarksville, IN) is 803.13 mi.
965 mi = 1,553.13 kms