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 Durban is March and the most expensive month to fly is April. (Average prices, based on 308 datapoints.)
The best day to arrive at Johannesburg is Tuesday and it would be best to avoid Friday, as prices are on average 109.92% higher than on Tuesday. (Average prices, based on 362 datapoints.)