There are
1,837 mi
from Thornton, CO to Zephyrhills, FL
That's the driving distance. It would take 1 day 9 hours to go from Thornton, Colorado to Zephyrhills, Florida.
The flight distance (direct flight from Thornton, CO to Zephyrhills, FL) is 1,525.58 mi.
1,837 mi = 1.61 kms