Flight John F Kennedy International Airport departs from New York John F Kennedy International Airport at 11:15 and arrives at Johannesburg OR Tambo International Airport at 08:00.
The flighttime is about 14h 45m. The distance travelled ("as the bird flies"): 12335 Km. So the average speed is roughly 836 Km.
There is an 6 hour time difference between New York and Johannesburg