The calculated distance (air line) between Pfäffikon / Pfäffikon (Dorfkern) and Montreux is approximately 110 miles respectively 176 kilometers.
By car or train, the actual journey to Montreux is certainly longer, as only the direct route (as the crow flies) between Pfäffikon / Pfäffikon (Dorfkern) and Montreux has been calculated here.
Air line (approximately)
176 kilometers
95 nautical miles