The calculated distance (air line) between Luzern and Zürich (Kreis 12) is approximately 27 miles respectively 44 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Luzern and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles