There are
770 mi
from Knoxville, TN to Danbury, CT
That's the driving distance. It would take 14 hours 44 mins to go from Knoxville, Tennessee to Danbury, Connecticut.
The flight distance (direct flight from Knoxville, TN to Danbury, CT) is 677.25 mi.
770 mi = 1,239.18 kms