There are
609 mi
from Clarksville, TN to Altoona, IA
That's the driving distance. It would take 11 hours 48 mins to go from Clarksville, Tennessee to Altoona, Iowa.
The flight distance (direct flight from Clarksville, TN to Altoona, IA) is 482.05 mi.
609 mi = 979.59 kms