Flight Jomo Kenyatta International Airport departs from Nairobi Jomo Kenyatta International Airport at 15:55 and arrives at Johannesburg OR Tambo International Airport at 19:00.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 2508 Km. So the average speed is roughly 614 Km.
There is an 1 hour time difference between Nairobi and Johannesburg