Davi

What class are you looking at purchasing? Jumping on a South African Airways flight across to JNB and purchasing your OWE originating in JNB will save you about $US900 in economy and $3000 in business and first compared to the prices ex Brasil. Given a GRU-JNB return costs around $1000, if you are flying economy you don't save but if Business or First its worth looking at.

It would also allow you to split your RTW into 2 distinct trips if that interested you eg GRU-JNB-Asia-Australia/NZ-SAm-GRU and GRU-Europe-JNB-GRU