There are
2,013 mi
from St Charles, MO to Clearlake, CA
That's the driving distance. It would take 1 day 11 hours to go from St Charles, Missouri to Clearlake, California.
The flight distance (direct flight from St Charles, MO to Clearlake, CA) is 1,718.44 mi.
2,013 mi = 3,238.96 kms