The calculated distance (air line) between Oberwinterthur (Kreis 2) and Montreux is approximately 115 miles respectively 185 kilometers.
By car or train, the actual journey to Montreux is certainly longer, as only the direct route (as the crow flies) between Oberwinterthur (Kreis 2) and Montreux has been calculated here.
Air line (approximately)
185 kilometers
100 nautical miles