The calculated distance (air line) between Uster / Ober-Uster and Emmen is approximately 29 miles respectively 46 kilometers.
By car or train, the actual journey to Emmen is certainly longer, as only the direct route (as the crow flies) between Uster / Ober-Uster and Emmen has been calculated here.
Air line (approximately)
46 kilometers
25 nautical miles