There are
1,798 mi
from Riverside, CA to Cahokia, IL
That's the driving distance. It would take 1 day 7 hours to go from Riverside, California to Cahokia, Illinois.
The flight distance (direct flight from Riverside, CA to Cahokia, IL) is 1,542.89 mi.
1,798 mi = 2,893.35 kms