The calculated distance (air line) between Le Mont-sur-Lausanne and Schaffhausen is approximately 123 miles respectively 198 kilometers.
By car or train, the actual journey to Schaffhausen is certainly longer, as only the direct route (as the crow flies) between Le Mont-sur-Lausanne and Schaffhausen has been calculated here.
Air line (approximately)
198 kilometers
107 nautical miles