The calculated distance (air line) between La Chaux-de-Fonds and Zürich (Kreis 9) / Altstetten is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) / Altstetten is certainly longer, as only the direct route (as the crow flies) between La Chaux-de-Fonds and Zürich (Kreis 9) / Altstetten has been calculated here.
Air line (approximately)
129 kilometers
70 nautical miles