The calculated distance (air line) between Zürich (Kreis 2) / Enge and Montreux is approximately 100 miles respectively 161 kilometers.
By car or train, the actual journey to Montreux is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 2) / Enge and Montreux has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles