There are
1,821 mi
from Buena Park, CA to Festus, MO
That's the driving distance. It would take 1 day 7 hours to go from Buena Park, California to Festus, Missouri.
The flight distance (direct flight from Buena Park, CA to Festus, MO) is 1,565 mi.
1,821 mi = 2,929.88 kms