There are
1,805 mi
from St Charles, MO to Azusa, CA
That's the driving distance. It would take 1 day 7 hours to go from St Charles, Missouri to Azusa, California.
The flight distance (direct flight from St Charles, MO to Azusa, CA) is 1,549.82 mi.
1,805 mi = 2,905.33 kms