There are
1,817 mi
from St Charles, MO to Placentia, CA
That's the driving distance. It would take 1 day 7 hours to go from St Charles, Missouri to Placentia, California.
The flight distance (direct flight from St Charles, MO to Placentia, CA) is 1,554.03 mi.
1,817 mi = 2,924.22 kms