There are
2,104 mi
from Carlsbad, CA to Clarksville, IN
That's the driving distance. It would take 1 day 13 hours to go from Carlsbad, California to Clarksville, Indiana.
The flight distance (direct flight from Carlsbad, CA to Clarksville, IN) is 1,798.02 mi.
2,104 mi = 3,386.08 kms