There are
1,604 mi
from San Clemente, CA to Mandan, ND
That's the driving distance. It would take 1 day 4 hours to go from San Clemente, California to Mandan, North Dakota.
The flight distance (direct flight from San Clemente, CA to Mandan, ND) is 1,274.41 mi.
1,604 mi = 2,580.87 kms