There are
1,949 mi
from Whittier, CA to Dekalb, IL
That's the driving distance. It would take 1 day 10 hours to go from Whittier, California to Dekalb, Illinois.
The flight distance (direct flight from Whittier, CA to Dekalb, IL) is 1,677.50 mi.
1,949 mi = 1.61 kms