JFK -JNB Nonstop on SAA $653

[Yehuda57]

Bookable on flysaa.com. Does not appear to be available on other booking sites.

I saw availability over March and April.

ETA: You can hold the fare for 72 hours.

[Yaalili]

$694 RT for nonstop JFK to Johannesburg (JNB) on SAA.
 
http://www.theflightdeal.com/2017/01/12/south-african-airways-694-new-york-washington-d-c-johannesburg-south-africa-roundtrip-including-all-taxes/