The calculated distance (air line) between Rotkreuz and Zürich (Kreis 6) is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Zürich (Kreis 6) is certainly longer, as only the direct route (as the crow flies) between Rotkreuz and Zürich (Kreis 6) has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles