The calculated distance (air line) between Zastron and Phuthaditjhaba is approximately 161 miles respectively 259 kilometers.
By car or train, the actual journey to Phuthaditjhaba is certainly longer, as only the direct route (as the crow flies) between Zastron and Phuthaditjhaba has been calculated here.
Air line (approximately)
259 kilometers
140 nautical miles