The calculated distance (air line) between Le Locle and Zürich (Kreis 9) is approximately 84 miles respectively 136 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 Le Locle and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
136 kilometers
73 nautical miles