The calculated distance (air line) between La Chaux-de-Fonds and Zürich (Kreis 12) is approximately 85 miles respectively 136 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between La Chaux-de-Fonds and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
136 kilometers
74 nautical miles