There are
987 mi
from Bismarck, ND to Hereford, TX
That's the driving distance. It would take 18 hours 50 mins to go from Bismarck, North Dakota to Hereford, Texas.
The flight distance (direct flight from Bismarck, ND to Hereford, TX) is 832.89 mi.
987 mi = 1,588.29 kms