The calculated distance (air line) between La Chaux-de-Fonds and Rapperswil is approximately 94 miles respectively 152 kilometers.
By car or train, the actual journey to Rapperswil is certainly longer, as only the direct route (as the crow flies) between La Chaux-de-Fonds and Rapperswil has been calculated here.
Air line (approximately)
152 kilometers
82 nautical miles