Flexible travelers in Spain will surely appreciate this solution based on their national airlines Iberia. (Members of Oneworld alliance). If you can depart in March 2019 you can book discounted non-stop flights from Madrid to Johannesburg already for €316. This is for a roundtrip ticket incl. all taxes and fees and onboard meals. (But excluding checked bag). Moreover you can fly from other Spanish citids alreayd for €303..look for flights departing from Bilbao, Basrcelona, Malaga etc..
As mentioned this is a last-minute offer only available when departing from Madrid to Johannesburg in March 2019. Max stay 12 months. Book this Iberia promotion by 13th of February. Below you can refer to our booking as well as most of outbound travel date samples available.
Booking sample
Madrid - Johannesburg from €319 (Directly with Iberia)
Madrid - Johannesburg from €316 (Non-stop flight)
Bilbao - Johannesburg from €303
Barcelona - Johannesburg from €312
Malaga - Johannesburg from €323
Travel samples Madrid - Johannesburg - Madrid
4. - 21.3.
9. - 24.3.
11. - 26.3.
13. - 28.3.
18.3. - 3.4.
20.3. - 5.4.
Booking sample of Cheap non-stop flights from Madrid to Johannesburg from €316 here. As per our booking sample your outbound flight from Spain to Republic of South Africa would be on 9th of March. Inbound flight from this African country back to Madrid on 24th of March 2019.