There are
1,588 mi
from Bismarck, ND to Downey, CA
That's the driving distance. It would take 1 day 4 hours to go from Bismarck, North Dakota to Downey, California.
The flight distance (direct flight from Bismarck, ND to Downey, CA) is 1,269.11 mi.
1,588 mi = 2,556.26 kms