There are
815 mi
from Fayetteville, AR to Longmont, CO
That's the driving distance. It would take 14 hours 29 mins to go from Fayetteville, Arkansas to Longmont, Colorado.
The flight distance (direct flight from Fayetteville, AR to Longmont, CO) is 658.45 mi.
815 mi = 1,311.31 kms