The calculated distance (air line) between Eschenbach and La Chaux-de-Fonds is approximately 99 miles respectively 159 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 Eschenbach and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
159 kilometers
86 nautical miles