Flight OR Tambo International Airport departs from Johannesburg OR Tambo International Airport at 06:30 and arrives at Windhoek Hosea Kutako International Airport at 08:45.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 1255 Km. So the average speed is roughly 295 Km.
There is an 2 hour time difference between Johannesburg and Windhoek