| Portet-sur-Garonne to Settimo Torinese | 333.40 mi (536.56 km) |
| Portet-sur-Garonne to Seveso | 407.51 mi (655.83 km) |
| Portet-sur-Garonne to Sezze | 609.54 mi (980.97 km) |
| Portet-sur-Garonne to Siano | 705.15 mi (1,134.82 km) |
| Portet-sur-Garonne to Siena | 498.00 mi (801.46 km) |
| Portet-sur-Garonne to Signa | 484.67 mi (780.01 km) |
| Portet-sur-Garonne to Silea | 555.28 mi (893.63 km) |
| Portet-sur-Garonne to Silvi Paese | 644.78 mi (1,037.67 km) |
| Portet-sur-Garonne to Sinalunga | 518.80 mi (834.92 km) |
| Portet-sur-Garonne to Siniscola | 471.30 mi (758.48 km) |
| Portet-sur-Garonne to Sinnai | 497.86 mi (801.23 km) |
| Portet-sur-Garonne to Siracusa | 855.00 mi (1,375.99 km) |
| Portet-sur-Garonne to Solaro | 404.44 mi (650.89 km) |
| Portet-sur-Garonne to Soliera | 479.17 mi (771.15 km) |
| Portet-sur-Garonne to Solofra | 712.09 mi (1,146.00 km) |
