There are
1,420 mi
from Garland, TX to Monrovia, CA
That's the driving distance. It would take 1 day to go from Garland, Texas to Monrovia, California.
The flight distance (direct flight from Garland, TX to Monrovia, CA) is 1,231.15 mi.
1,420 mi = 2,284.91 kms