The calculated distance (air line) between Roodepoort and Phuthaditjhaba is approximately 173 miles respectively 279 kilometers.
By car or train, the actual journey to Phuthaditjhaba is certainly longer, as only the direct route (as the crow flies) between Roodepoort and Phuthaditjhaba has been calculated here.
Air line (approximately)
279 kilometers
150 nautical miles