| Sint-Pieters-Leeuw to Somma Lombardo | 407.39 mi (655.64 km) |
| Sint-Pieters-Leeuw to Somma Vesuviana | 840.60 mi (1,352.82 km) |
| Sint-Pieters-Leeuw to Sommacampagna | 480.36 mi (773.06 km) |
| Sint-Pieters-Leeuw to Sona | 478.03 mi (769.32 km) |
| Sint-Pieters-Leeuw to Sondrio | 409.48 mi (659.00 km) |
| Sint-Pieters-Leeuw to Sora | 768.56 mi (1,236.88 km) |
| Sint-Pieters-Leeuw to Sorbolo | 500.60 mi (805.63 km) |
| Sint-Pieters-Leeuw to Soresina | 459.43 mi (739.38 km) |
| Sint-Pieters-Leeuw to Sorisole | 427.99 mi (688.78 km) |
| Sint-Pieters-Leeuw to Sorrento | 853.25 mi (1,373.18 km) |
| Sint-Pieters-Leeuw to Sorso | 720.38 mi (1,159.34 km) |
| Sint-Pieters-Leeuw to Sortino | 1,080.30 mi (1,738.58 km) |
| Sint-Pieters-Leeuw to Soverato Marina | 1,028.29 mi (1,654.87 km) |
| Sint-Pieters-Leeuw to Sovicille | 613.12 mi (986.72 km) |
| Sint-Pieters-Leeuw to Spello | 668.56 mi (1,075.94 km) |
