There are
2,049 mi
from St Charles, MO to Pacifica, CA
That's the driving distance. It would take 1 day 11 hours to go from St Charles, Missouri to Pacifica, California.
The flight distance (direct flight from St Charles, MO to Pacifica, CA) is 1,729.19 mi.
2,049 mi = 3,296.77 kms