The calculated distance (air line) between Lengnau and Zürich (Kreis 9) / Altstetten is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) / Altstetten is certainly longer, as only the direct route (as the crow flies) between Lengnau and Zürich (Kreis 9) / Altstetten has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles