The calculated distance (air line) between Johannesburg and Phuthaditjhaba is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Phuthaditjhaba is certainly longer, as only the direct route (as the crow flies) between Johannesburg and Phuthaditjhaba has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles