There are
1,018 mi
from Amarillo, TX to Clarksville, IN
That's the driving distance. It would take 18 hours 5 mins to go from Amarillo, Texas to Clarksville, Indiana.
The flight distance (direct flight from Amarillo, TX to Clarksville, IN) is 913.32 mi.
1,018 mi = 1,637.68 kms