There are
2,108 mi
from Naperville, IL to San Leandro, CA
That's the driving distance. It would take 1 day 12 hours to go from Naperville, Illinois to San Leandro, California.
The flight distance (direct flight from Naperville, IL to San Leandro, CA) is 1,816.04 mi.
2,108 mi = 3.22 kms