There are
1,657 mi
from Bismarck, ND to Watsonville, CA
That's the driving distance. It would take 1 day 5 hours to go from Bismarck, North Dakota to Watsonville, California.
The flight distance (direct flight from Bismarck, ND to Watsonville, CA) is 1,271.54 mi.
1,657 mi = 2,666.87 kms