There are
796 mi
from Bismarck, ND to Dekalb, IL
That's the driving distance. It would take 14 hours 6 mins to go from Bismarck, North Dakota to Dekalb, Illinois.
The flight distance (direct flight from Bismarck, ND to Dekalb, IL) is 682.22 mi.
796 mi = 1,280.33 kms