The calculated distance (air line) between Saint-Yrieix-sur-Charente and Nantes is approximately 133 miles respectively 214 kilometers.
By car or train, the actual journey to Nantes is certainly longer, as only the direct route (as the crow flies) between Saint-Yrieix-sur-Charente and Nantes has been calculated here.
Air line (approximately)
214 kilometers
116 nautical miles