There are
1,953 mi
from Buena Park, CA to Dekalb, IL
That's the driving distance. It would take 1 day 10 hours to go from Buena Park, California to Dekalb, Illinois.
The flight distance (direct flight from Buena Park, CA to Dekalb, IL) is 1,679.33 mi.
1,953 mi = 1.61 kms