The calculated distance (air line) between Zürich (Kreis 9) / Altstetten and Emmen is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Emmen is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 9) / Altstetten and Emmen has been calculated here.
Air line (approximately)
38 kilometers
21 nautical miles