There are
1,783 mi
from Rialto, CA to Lake St Louis, MO
That's the driving distance. It would take 1 day 7 hours to go from Rialto, California to Lake St Louis, Missouri.
The flight distance (direct flight from Rialto, CA to Lake St Louis, MO) is 1,506.65 mi.
1,783 mi = 1.61 kms