The calculated distance (air line) between Kriens and Zürich (Kreis 3) is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Zürich (Kreis 3) is certainly longer, as only the direct route (as the crow flies) between Kriens and Zürich (Kreis 3) has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles