There are
1,838 mi
from Rialto, CA to Cape Girardeau, MO
That's the driving distance. It would take 1 day 8 hours to go from Rialto, California to Cape Girardeau, Missouri.
The flight distance (direct flight from Rialto, CA to Cape Girardeau, MO) is 1,572.41 mi.
1,838 mi = 1.61 kms