The calculated distance (air line) between Sitten and La Chaux-de-Fonds is approximately 65 miles respectively 105 kilometers.
By car or train, the actual journey to La Chaux-de-Fonds is certainly longer, as only the direct route (as the crow flies) between Sitten and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
105 kilometers
57 nautical miles