The calculated distance (air line) between Saint-Yrieix-la-Perche and Nantes is approximately 176 miles respectively 284 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-la-Perche and Nantes has been calculated here.
Air line (approximately)
284 kilometers
153 nautical miles