The calculated distance (air line) between Locarno and Zürich (Kreis 9) is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) is certainly longer, as only the direct route (as the crow flies) between Locarno and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles