| Somma Lombardo to Sestu | 441.53 mi (710.58 km) |
| Somma Lombardo to Settimo Torinese | 59.11 mi (95.12 km) |
| Somma Lombardo to Seveso | 21.30 mi (34.28 km) |
| Somma Lombardo to Sezze | 362.22 mi (582.94 km) |
| Somma Lombardo to Siano | 452.23 mi (727.79 km) |
| Somma Lombardo to Siena | 208.58 mi (335.68 km) |
| Somma Lombardo to Signa | 176.36 mi (283.83 km) |
| Somma Lombardo to Silea | 173.65 mi (279.47 km) |
| Somma Lombardo to Silvi Paese | 344.92 mi (555.09 km) |
| Somma Lombardo to Sinalunga | 226.74 mi (364.91 km) |
| Somma Lombardo to Siniscola | 356.55 mi (573.81 km) |
| Somma Lombardo to Sinnai | 441.61 mi (710.70 km) |
| Somma Lombardo to Siracusa | 685.64 mi (1,103.42 km) |
| Somma Lombardo to Solaro | 19.13 mi (30.79 km) |
| Somma Lombardo to Soliera | 126.44 mi (203.49 km) |
