The calculated distance (air line) between Uster and La Chaux-de-Fonds is approximately 91 miles respectively 146 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 Uster and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles