There are
2,146 mi
from Dekalb, IL to Mendota, CA
That's the driving distance. It would take 1 day 13 hours to go from Dekalb, Illinois to Mendota, California.
The flight distance (direct flight from Dekalb, IL to Mendota, CA) is 1,717.38 mi.
2,146 mi = 3,454.19 kms