The calculated distance (air line) between Oberwinterthur (Kreis 2) and Luzern is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Luzern is certainly longer, as only the direct route (as the crow flies) between Oberwinterthur (Kreis 2) and Luzern has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles