The calculated distance (air line) between Uster / Kirch-Uster and Emmen is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Emmen is certainly longer, as only the direct route (as the crow flies) between Uster / Kirch-Uster and Emmen has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles