There are
1,618 mi
from Oceanside, CA to Mandan, ND
That's the driving distance. It would take 1 day 4 hours to go from Oceanside, California to Mandan, North Dakota.
The flight distance (direct flight from Oceanside, CA to Mandan, ND) is 1,278.67 mi.
1,618 mi = 1.61 kms