There are
1,999 mi
from Dekalb, IL to Poway, CA
That's the driving distance. It would take 1 day 10 hours to go from Dekalb, Illinois to Poway, California.
The flight distance (direct flight from Dekalb, IL to Poway, CA) is 1,661.15 mi.
1,999 mi = 3,217.41 kms