There are
1,944 mi
from Dekalb, IL to Placentia, CA
That's the driving distance. It would take 1 day 9 hours to go from Dekalb, Illinois to Placentia, California.
The flight distance (direct flight from Dekalb, IL to Placentia, CA) is 1,672.69 mi.
1,944 mi = 3,128.69 kms