There are
1,378 mi
from Thornton, CO to Sylacauga, AL
That's the driving distance. It would take 1 day to go from Thornton, Colorado to Sylacauga, Alabama.
The flight distance (direct flight from Thornton, CO to Sylacauga, AL) is 1,134.81 mi.
1,378 mi = 1.61 kms