There are
1,811 mi
from St Charles, MO to Monrovia, CA
That's the driving distance. It would take 1 day 7 hours to go from St Charles, Missouri to Monrovia, California.
The flight distance (direct flight from St Charles, MO to Monrovia, CA) is 1,554.62 mi.
1,811 mi = 2,914.13 kms