The calculated distance (air line) between Yverdon-les-Bains and Montreux is approximately 27 miles respectively 44 kilometers.
By car or train, the actual journey to Montreux is certainly longer, as only the direct route (as the crow flies) between Yverdon-les-Bains and Montreux has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles