The calculated distance (air line) between León de los Aldama and San Miguel de Allende is approximately 62 miles respectively 99 kilometers.
By car or train, the actual journey to San Miguel de Allende is certainly longer, as only the direct route (as the crow flies) between León de los Aldama and San Miguel de Allende has been calculated here.
Air line (approximately)
99 kilometers
54 nautical miles