There are
1,858 mi
from Oceanside, CA to Cahokia, IL
That's the driving distance. It would take 1 day 8 hours to go from Oceanside, California to Cahokia, Illinois.
The flight distance (direct flight from Oceanside, CA to Cahokia, IL) is 1,560.46 mi.
1,858 mi = 1.61 kms