The calculated distance (air line) between Wil and La Chaux-de-Fonds is approximately 107 miles respectively 172 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 Wil and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
172 kilometers
93 nautical miles