There are
707 mi
from Knoxville, TN to Fayetteville, AR
That's the driving distance. It would take 12 hours 35 mins to go from Knoxville, Tennessee to Fayetteville, Arkansas.
The flight distance (direct flight from Knoxville, TN to Fayetteville, AR) is 571.90 mi.
707 mi = 1,138.54 kms