There are
2,020 mi
from Chatham, IL to Clearlake, CA
That's the driving distance. It would take 1 day 11 hours to go from Chatham, Illinois to Clearlake, California.
The flight distance (direct flight from Chatham, IL to Clearlake, CA) is 1,750.56 mi.
2,020 mi = 3,251.06 kms