There are
710 mi
from Provo, UT to El Cajon, CA
That's the driving distance. It would take 12 hours 27 mins to go from Provo, Utah to El Cajon, California.
The flight distance (direct flight from Provo, UT to El Cajon, CA) is 592.10 mi.
710 mi = 1,142.45 kms