The calculated distance (air line) between Semonkong and Butha-Buthe is approximately 75 miles respectively 121 kilometers.
By car or train, the actual journey to Butha-Buthe is certainly longer, as only the direct route (as the crow flies) between Semonkong and Butha-Buthe has been calculated here.
Air line (approximately)
121 kilometers
65 nautical miles