There are
722 mi
from Simi Valley, CA to Farmington, UT
That's the driving distance. It would take 12 hours 53 mins to go from Simi Valley, California to Farmington, Utah.
The flight distance (direct flight from Simi Valley, CA to Farmington, UT) is 597.35 mi.
722 mi = 1,162.30 kms