The calculated distance (air line) between Poitiers and Saint-Cyr-sur-Loire is approximately 59 miles respectively 94 kilometers.
By car or train, the actual journey to Saint-Cyr-sur-Loire is certainly longer, as only the direct route (as the crow flies) between Poitiers and Saint-Cyr-sur-Loire has been calculated here.
Air line (approximately)
94 kilometers
51 nautical miles