The calculated distance (air line) between Butha-Buthe and Thaba Nchu is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to Thaba Nchu is certainly longer, as only the direct route (as the crow flies) between Butha-Buthe and Thaba Nchu has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles