The calculated distance (air line) between Estavayer-le-Lac and Luzern is approximately 70 miles respectively 113 kilometers.
By car or train, the actual journey to Luzern is certainly longer, as only the direct route (as the crow flies) between Estavayer-le-Lac and Luzern has been calculated here.
Air line (approximately)
113 kilometers
61 nautical miles