| Castelletto sopra Ticino to Somma Lombardo | 3.96 mi (6.37 km) |
| Castelletto sopra Ticino to Somma Vesuviana | 443.83 mi (714.27 km) |
| Castelletto sopra Ticino to Sommacampagna | 109.45 mi (176.13 km) |
| Castelletto sopra Ticino to Sona | 108.18 mi (174.10 km) |
| Castelletto sopra Ticino to Sondrio | 67.16 mi (108.08 km) |
| Castelletto sopra Ticino to Sora | 371.76 mi (598.28 km) |
| Castelletto sopra Ticino to Sorbolo | 106.79 mi (171.86 km) |
| Castelletto sopra Ticino to Soresina | 66.30 mi (106.69 km) |
| Castelletto sopra Ticino to Sorisole | 49.37 mi (79.45 km) |
| Castelletto sopra Ticino to Sorrento | 455.04 mi (732.32 km) |
| Castelletto sopra Ticino to Sorso | 339.84 mi (546.92 km) |
| Castelletto sopra Ticino to Sortino | 676.86 mi (1,089.29 km) |
| Castelletto sopra Ticino to Soverato Marina | 632.08 mi (1,017.23 km) |
| Castelletto sopra Ticino to Sovicille | 211.36 mi (340.16 km) |
| Castelletto sopra Ticino to Spello | 274.41 mi (441.62 km) |
