There are
702 mi
from Buena Park, CA to Farmington, UT
That's the driving distance. It would take 12 hours 13 mins to go from Buena Park, California to Farmington, Utah.
The flight distance (direct flight from Buena Park, CA to Farmington, UT) is 594.59 mi.
702 mi = 1,128.98 kms