There are
1,835 mi
from Thornton, CO to De Bary, FL
That's the driving distance. It would take 1 day 9 hours to go from Thornton, Colorado to De Bary, Florida.
The flight distance (direct flight from Thornton, CO to De Bary, FL) is 1,540.49 mi.
1,835 mi = 1.61 kms