Flight Jomo Kenyatta International Airport departs from Nairobi Jomo Kenyatta International Airport at 21:00 and arrives at Johannesburg OR Tambo International Airport at 00:15.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 2508 Km. So the average speed is roughly 590 Km.
There is an 1 hour time difference between Nairobi and Johannesburg