There are
1,818 mi
from Fullerton, CA to St Charles, MO
That's the driving distance. It would take 1 day 7 hours to go from Fullerton, California to St Charles, Missouri.
The flight distance (direct flight from Fullerton, CA to St Charles, MO) is 1,557.03 mi.
1,818 mi = 2,925.57 kms