There are
1,845 mi
from Thornton, CO to Naugatuck, CT
That's the driving distance. It would take 1 day 9 hours to go from Thornton, Colorado to Naugatuck, Connecticut.
The flight distance (direct flight from Thornton, CO to Naugatuck, CT) is 1,666.91 mi.
1,845 mi = 1.61 kms