There are
2,037 mi
from San Clemente, CA to Prospect Heights, IL
That's the driving distance. It would take 1 day 11 hours to go from San Clemente, California to Prospect Heights, Illinois.
The flight distance (direct flight from San Clemente, CA to Prospect Heights, IL) is 1,717.46 mi.
2,037 mi = 3,278.60 kms