The calculated distance (air line) between Diepsloot and Phuthaditjhaba is approximately 186 miles respectively 299 kilometers.
By car or train, the actual journey to Phuthaditjhaba is certainly longer, as only the direct route (as the crow flies) between Diepsloot and Phuthaditjhaba has been calculated here.
Air line (approximately)
299 kilometers
161 nautical miles