The calculated distance (air line) between San Martín Hidalgo and Aguascalientes is approximately 146 miles respectively 234 kilometers.
By car or train, the actual journey to Aguascalientes is certainly longer, as only the direct route (as the crow flies) between San Martín Hidalgo and Aguascalientes has been calculated here.
Air line (approximately)
234 kilometers
127 nautical miles