There are
1,200 mi
from Thornton, CO to San Benito, TX
That's the driving distance. It would take 21 hours 26 mins to go from Thornton, Colorado to San Benito, Texas.
The flight distance (direct flight from Thornton, CO to San Benito, TX) is 1,039.01 mi.
1,200 mi = 1.61 kms