There are
1,296 mi
from Thornton, CO to Amherst, OH
That's the driving distance. It would take 23 hours 8 mins to go from Thornton, Colorado to Amherst, Ohio.
The flight distance (direct flight from Thornton, CO to Amherst, OH) is 1,194.09 mi.
1,296 mi = 1.61 kms