There are
1,540 mi
from Rialto, CA to Mandan, ND
That's the driving distance. It would take 1 day 3 hours to go from Rialto, California to Mandan, North Dakota.
The flight distance (direct flight from Rialto, CA to Mandan, ND) is 1,229.16 mi.
1,540 mi = 1.61 kms