The calculated distance (air line) between Steffisburg and La Chaux-de-Fonds is approximately 44 miles respectively 71 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 Steffisburg and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles