There are
451 mi
from Flagstaff, AZ to Monrovia, CA
That's the driving distance. It would take 7 hours 57 mins to go from Flagstaff, Arizona to Monrovia, California.
The flight distance (direct flight from Flagstaff, AZ to Monrovia, CA) is 368.80 mi.
451 mi = 725.88 kms