The calculated distance (air line) between Chavannes and La Chaux-de-Fonds is approximately 41 miles respectively 66 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 Chavannes and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
66 kilometers
36 nautical miles