| Sint-Pieters-Leeuw to Settimo Torinese | 422.81 mi (680.44 km) |
| Sint-Pieters-Leeuw to Seveso | 420.21 mi (676.26 km) |
| Sint-Pieters-Leeuw to Sezze | 766.63 mi (1,233.78 km) |
| Sint-Pieters-Leeuw to Siano | 851.88 mi (1,370.97 km) |
| Sint-Pieters-Leeuw to Siena | 613.50 mi (987.34 km) |
| Sint-Pieters-Leeuw to Signa | 579.96 mi (933.36 km) |
| Sint-Pieters-Leeuw to Silea | 512.08 mi (824.11 km) |
| Sint-Pieters-Leeuw to Silvi Paese | 735.21 mi (1,183.21 km) |
| Sint-Pieters-Leeuw to Sinalunga | 629.89 mi (1,013.72 km) |
| Sint-Pieters-Leeuw to Siniscola | 752.26 mi (1,210.64 km) |
| Sint-Pieters-Leeuw to Sinnai | 828.79 mi (1,333.81 km) |
| Sint-Pieters-Leeuw to Siracusa | 1,092.53 mi (1,758.26 km) |
| Sint-Pieters-Leeuw to Solaro | 420.59 mi (676.88 km) |
| Sint-Pieters-Leeuw to Soliera | 519.70 mi (836.38 km) |
| Sint-Pieters-Leeuw to Solofra | 854.48 mi (1,375.15 km) |
