The calculated distance (air line) between Zürich (Kreis 7) / Fluntern and Luzern is approximately 26 miles respectively 41 kilometers.
By car or train, the actual journey to Luzern is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 7) / Fluntern and Luzern has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles