There are
2,081 mi
from Hayward, CA to Dekalb, IL
That's the driving distance. It would take 1 day 11 hours to go from Hayward, California to Dekalb, Illinois.
The flight distance (direct flight from Hayward, CA to Dekalb, IL) is 1,782.13 mi.
2,081 mi = 3.22 kms