There are
2,053 mi
from St Charles, MO to Gilroy, CA
That's the driving distance. It would take 1 day 12 hours to go from St Charles, Missouri to Gilroy, California.
The flight distance (direct flight from St Charles, MO to Gilroy, CA) is 1,689.61 mi.
2,053 mi = 3,303.40 kms