There are
2,423 mi
from Jacksonville Beach, FL to Monrovia, CA
That's the driving distance. It would take 1 day 18 hours to go from Jacksonville Beach, Florida to Monrovia, California.
The flight distance (direct flight from Jacksonville Beach, FL to Monrovia, CA) is 2,144.99 mi.
2,423 mi = 3,898.66 kms