There are
1,842 mi
from San Clemente, CA to Maryland Heights, MO
That's the driving distance. It would take 1 day 8 hours to go from San Clemente, California to Maryland Heights, Missouri.
The flight distance (direct flight from San Clemente, CA to Maryland Heights, MO) is 1,555.16 mi.
1,842 mi = 2,963.73 kms