The calculated distance (air line) between Flawil and La Chaux-de-Fonds is approximately 113 miles respectively 181 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 Flawil and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
181 kilometers
98 nautical miles