There are
1,935 mi
from Dekalb, IL to Walnut, CA
That's the driving distance. It would take 1 day 9 hours to go from Dekalb, Illinois to Walnut, California.
The flight distance (direct flight from Dekalb, IL to Walnut, CA) is 1,667.66 mi.
1,935 mi = 3,113.30 kms