Question : In the next four weeks, what day should you book your trip?
Answer : Since low prices are preferred, look at Mar 21st. As of Feb 27th, it's showing the cheapest ticket sales at $689. That is 67% below the average price for this route, so you can spend that extra cash on an adventure rather than the flight.
Question : Do prices fluctuate more for this route than others?
Answer : Flight prices change a lot more than the majority of routes from the Republic of China Taiwan for TPE to JNB. They vary anywhere from $635 to $3,314. Prices tend to be lower the further out you book.
Question : How long do most people visit Johannesburg?
Answer : Of course you're not most people, but if you were, you'd stay roughly 15 days.
Question : Would you be willing to change your travel days if it saved you money?
Answer : In March, the cheapest day to fly is Tuesday. Being flexible with your travel days garners even more savings during booking.