There are
2,074 mi
from Hayward, CA to Cahokia, IL
That's the driving distance. It would take 1 day 11 hours to go from Hayward, California to Cahokia, Illinois.
The flight distance (direct flight from Hayward, CA to Cahokia, IL) is 1,725.89 mi.
2,074 mi = 3.22 kms