There are
2,081 mi
from Naperville, IL to Clearlake, CA
That's the driving distance. It would take 1 day 12 hours to go from Naperville, Illinois to Clearlake, California.
The flight distance (direct flight from Naperville, IL to Clearlake, CA) is 1,813.18 mi.
2,081 mi = 3.22 kms