There are
1,956 mi
from Naperville, IL to Montclair, CA
That's the driving distance. It would take 1 day 10 hours to go from Naperville, Illinois to Montclair, California.
The flight distance (direct flight from Naperville, IL to Montclair, CA) is 1,686.02 mi.
1,956 mi = 1.61 kms