There are
2,057 mi
from St Charles, MO to Ukiah, CA
That's the driving distance. It would take 1 day 12 hours to go from St Charles, Missouri to Ukiah, California.
The flight distance (direct flight from St Charles, MO to Ukiah, CA) is 1,746.97 mi.
2,057 mi = 3,310.65 kms