There are
1,643 mi
from Bismarck, ND to Slidell, LA
That's the driving distance. It would take 1 day 5 hours to go from Bismarck, North Dakota to Slidell, Louisiana.
The flight distance (direct flight from Bismarck, ND to Slidell, LA) is 1,284.87 mi.
1,643 mi = 2,644.15 kms