The calculated distance (air line) between Langenthal and Zürich (Kreis 12) is approximately 39 miles respectively 62 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Langenthal and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
62 kilometers
34 nautical miles