There are
1,854 mi
from Thornton, CO to New Smyrna Beach, FL
That's the driving distance. It would take 1 day 9 hours to go from Thornton, Colorado to New Smyrna Beach, Florida.
The flight distance (direct flight from Thornton, CO to New Smyrna Beach, FL) is 1,554.26 mi.
1,854 mi = 1.61 kms