There are
1,576 mi
from Mill Valley, CA to Mandan, ND
That's the driving distance. It would take 1 day 3 hours to go from Mill Valley, California to Mandan, North Dakota.
The flight distance (direct flight from Mill Valley, CA to Mandan, ND) is 1,259.65 mi.
1,576 mi = 2,536.58 kms