Flight OR Tambo International Airport departs from Johannesburg OR Tambo International Airport at 21:10 and arrives at New York Newark Liberty International Airport at 06:40.
The flighttime is about 15h 30m. The distance travelled ("as the bird flies"): 12358 Km. So the average speed is roughly 797 Km.
There is an 6 hour time difference between Johannesburg and New York