The calculated distance (air line) between Düdingen and La Chaux-de-Fonds is approximately 24 miles respectively 39 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 Düdingen and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles