Please be aware that Johannesburg has multiple airports and that these results are for all airports serving the city.
The best month to fly between Johannesburg and Cape Town is June and the most expensive month to fly is December. (Average prices, based on 1041 datapoints.)
The best day to arrive at Johannesburg is Saturday and it would be best to avoid Friday, as prices are on average 74.09% higher than on Saturday. (Average prices, based on 366 datapoints.)
The cheapest airline flying from Johannesburg to Cape Town is Safair. They are 34% cheaper than South African Airways. (Average prices, based on 1064 datapoints.)
The best time to fly is at around 10. (Average prices, based on 1183 datapoints.)