There are
1,451 mi
from Mckinney, TX to Monrovia, CA
That's the driving distance. It would take 1 day to go from Mckinney, Texas to Monrovia, California.
The flight distance (direct flight from Mckinney, TX to Monrovia, CA) is 1,227.88 mi.
1,451 mi = 1.61 kms