The calculated distance (air line) between La Chaux-de-Fonds and Zürich (Kreis 9) is approximately 80 miles respectively 129 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 La Chaux-de-Fonds and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
129 kilometers
69 nautical miles