The calculated distance (air line) between Langnau and Zürich (Kreis 12) is approximately 49 miles respectively 79 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 Langnau and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles