There are
726 mi
from Clarksville, TN to North Tonawanda, NY
That's the driving distance. It would take 14 hours 6 mins to go from Clarksville, Tennessee to North Tonawanda, New York.
The flight distance (direct flight from Clarksville, TN to North Tonawanda, NY) is 636.30 mi.
726 mi = 1,167.75 kms