There are
1,841 mi
from San Clemente, CA to Festus, MO
That's the driving distance. It would take 1 day 8 hours to go from San Clemente, California to Festus, Missouri.
The flight distance (direct flight from San Clemente, CA to Festus, MO) is 1,554.28 mi.
1,841 mi = 2,963.04 kms