The calculated distance (air line) between Chêne-Bourg and Schaffhausen is approximately 155 miles respectively 249 kilometers.
By car or train, the actual journey to Schaffhausen is certainly longer, as only the direct route (as the crow flies) between Chêne-Bourg and Schaffhausen has been calculated here.
Air line (approximately)
249 kilometers
135 nautical miles