| Portici to Somma Lombardo | 439.67 mi (707.58 km) |
| Portici to Somma Vesuviana | 6.20 mi (9.97 km) |
| Portici to Sommacampagna | 362.07 mi (582.70 km) |
| Portici to Sona | 364.47 mi (586.56 km) |
| Portici to Sondrio | 432.11 mi (695.41 km) |
| Portici to Sora | 72.50 mi (116.68 km) |
| Portici to Sorbolo | 340.93 mi (548.68 km) |
| Portici to Soresina | 382.62 mi (615.77 km) |
| Portici to Sorisole | 413.34 mi (665.20 km) |
| Portici to Sorrento | 13.37 mi (21.51 km) |
| Portici to Sorso | 301.38 mi (485.02 km) |
| Portici to Sortino | 255.12 mi (410.57 km) |
| Portici to Soverato Marina | 188.55 mi (303.44 km) |
| Portici to Sovicille | 233.20 mi (375.29 km) |
| Portici to Spello | 172.70 mi (277.93 km) |
