The calculated distance (air line) between Welkom and Phuthaditjhaba is approximately 132 miles respectively 213 kilometers.
By car or train, the actual journey to Phuthaditjhaba is certainly longer, as only the direct route (as the crow flies) between Welkom and Phuthaditjhaba has been calculated here.
Air line (approximately)
213 kilometers
115 nautical miles