There are
1,785 mi
from St Louis, MO to San Jacinto, CA
That's the driving distance. It would take 1 day 7 hours to go from St Louis, Missouri to San Jacinto, California.
The flight distance (direct flight from St Louis, MO to San Jacinto, CA) is 1,523.15 mi.
1,785 mi = 2,873.15 kms