There are
646 mi
from Fayetteville, AR to Mt Prospect, IL
That's the driving distance. It would take 12 hours 21 mins to go from Fayetteville, Arkansas to Mt Prospect, Illinois.
The flight distance (direct flight from Fayetteville, AR to Mt Prospect, IL) is 532.05 mi.
646 mi = 1,039.36 kms