There are
2,011 mi
from Thornton, CO to Boynton Beach, FL
That's the driving distance. It would take 1 day 12 hours to go from Thornton, Colorado to Boynton Beach, Florida.
The flight distance (direct flight from Thornton, CO to Boynton Beach, FL) is 1,700.58 mi.
2,011 mi = 3.22 kms