There are
790 mi
from Fayetteville, AR to Thornton, CO
That's the driving distance. It would take 14 hours 6 mins to go from Fayetteville, Arkansas to Thornton, Colorado.
The flight distance (direct flight from Fayetteville, AR to Thornton, CO) is 644.52 mi.
790 mi = 1,270.61 kms