The calculated distance (air line) between Zürich (Kreis 11) / Seebach and Schaffhausen is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Schaffhausen is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 11) / Seebach and Schaffhausen has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles