There are
610 mi
from Cheyenne, WY to Mandan, ND
That's the driving distance. It would take 11 hours 8 mins to go from Cheyenne, Wyoming to Mandan, North Dakota.
The flight distance (direct flight from Cheyenne, WY to Mandan, ND) is 438.67 mi.
610 mi = 981.94 kms