There are
1,775 mi
from Riverside, CA to Ballwin, MO
That's the driving distance. It would take 1 day 6 hours to go from Riverside, California to Ballwin, Missouri.
The flight distance (direct flight from Riverside, CA to Ballwin, MO) is 1,523.81 mi.
1,775 mi = 2,856.29 kms