There are
1,583 mi
from Buena Park, CA to Mandan, ND
That's the driving distance. It would take 1 day 4 hours to go from Buena Park, California to Mandan, North Dakota.
The flight distance (direct flight from Buena Park, CA to Mandan, ND) is 1,264.83 mi.
1,583 mi = 1.61 kms