There are
805 mi
from Brookhaven, MS to Dekalb, IL
That's the driving distance. It would take 14 hours 56 mins to go from Brookhaven, Mississippi to Dekalb, Illinois.
The flight distance (direct flight from Brookhaven, MS to Dekalb, IL) is 721.19 mi.
805 mi = 1,295.39 kms