The calculated distance (air line) between Thaba-Tseka and Thaba Nchu is approximately 109 miles respectively 175 kilometers.
By car or train, the actual journey to Thaba Nchu is certainly longer, as only the direct route (as the crow flies) between Thaba-Tseka and Thaba Nchu has been calculated here.
Air line (approximately)
175 kilometers
94 nautical miles