There are
993 mi
from Clarksville, TN to Danbury, CT
That's the driving distance. It would take 18 hours 53 mins to go from Clarksville, Tennessee to Danbury, Connecticut.
The flight distance (direct flight from Clarksville, TN to Danbury, CT) is 817.93 mi.
993 mi = 1,598.81 kms