Originally Posted by Nutzzz

SQ doesn't have the rights to fly passengers between CPT and JNB. You have to book multi city SIN-CPT and JNB-SIN, and get a domestic flight

Originally Posted by Guy Betsy

You can't as SQ does not have traffic rights between the two cities even if its the same plane. If you want to stopover, you can but the only way is for you to combine SQ with SA flights, thereby losing your 15% discount award. Otherwise, you need to do an open jaw award, and then buy a ticket between CPT and JNB yourself.