The calculated distance (air line) between Torroella de Montgrí and Sant Martí is approximately 64 miles respectively 104 kilometers.
By car or train, the actual journey to Sant Martí is certainly longer, as only the direct route (as the crow flies) between Torroella de Montgrí and Sant Martí has been calculated here.
Air line (approximately)
104 kilometers
56 nautical miles