There are
2,052 mi
from Concord, CA to Dekalb, IL
That's the driving distance. It would take 1 day 11 hours to go from Concord, California to Dekalb, Illinois.
The flight distance (direct flight from Concord, CA to Dekalb, IL) is 1,772.34 mi.
2,052 mi = 3.22 kms