The calculated distance (air line) between Zürich (Kreis 6) / Unterstrass and Schaffhausen is approximately 21 miles respectively 34 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 6) / Unterstrass and Schaffhausen has been calculated here.
Air line (approximately)
34 kilometers
19 nautical miles