The calculated distance (air line) between Oberwinterthur (Kreis 2) and Vernier is approximately 155 miles respectively 250 kilometers.
By car or train, the actual journey to Vernier is certainly longer, as only the direct route (as the crow flies) between Oberwinterthur (Kreis 2) and Vernier has been calculated here.
Air line (approximately)
250 kilometers
135 nautical miles