There are
1,958 mi
from Dekalb, IL to Temecula, CA
That's the driving distance. It would take 1 day 10 hours to go from Dekalb, Illinois to Temecula, California.
The flight distance (direct flight from Dekalb, IL to Temecula, CA) is 1,648.70 mi.
1,958 mi = 3,151.67 kms