There are
1,900 mi
from St Charles, MO to Susanville, CA
That's the driving distance. It would take 1 day 8 hours to go from St Charles, Missouri to Susanville, California.
The flight distance (direct flight from St Charles, MO to Susanville, CA) is 1,600.74 mi.
1,900 mi = 3,058.05 kms