There are
1,952 mi
from Irvine, CA to Dekalb, IL
That's the driving distance. It would take 1 day 10 hours to go from Irvine, California to Dekalb, Illinois.
The flight distance (direct flight from Irvine, CA to Dekalb, IL) is 1,675.05 mi.
1,952 mi = 3,142.12 kms