There are
1,647 mi
from La Mesa, CA to Mandan, ND
That's the driving distance. It would take 1 day 5 hours to go from La Mesa, California to Mandan, North Dakota.
The flight distance (direct flight from La Mesa, CA to Mandan, ND) is 1,289.83 mi.
1,647 mi = 2,650.45 kms