| Castellammare del Golfo to Settimo Torinese | 557.36 mi (896.99 km) |
| Castellammare del Golfo to Seveso | 560.28 mi (901.68 km) |
| Castellammare del Golfo to Sezze | 240.21 mi (386.57 km) |
| Castellammare del Golfo to Siano | 214.85 mi (345.76 km) |
| Castellammare del Golfo to Siena | 374.52 mi (602.73 km) |
| Castellammare del Golfo to Signa | 408.46 mi (657.35 km) |
| Castellammare del Golfo to Silea | 527.92 mi (849.60 km) |
| Castellammare del Golfo to Silvi Paese | 319.26 mi (513.79 km) |
| Castellammare del Golfo to Sinalunga | 363.62 mi (585.18 km) |
| Castellammare del Golfo to Siniscola | 244.87 mi (394.08 km) |
| Castellammare del Golfo to Sinnai | 217.09 mi (349.37 km) |
| Castellammare del Golfo to Siracusa | 147.50 mi (237.38 km) |
| Castellammare del Golfo to Solaro | 559.41 mi (900.28 km) |
| Castellammare del Golfo to Soliera | 474.65 mi (763.88 km) |
| Castellammare del Golfo to Solofra | 220.57 mi (354.97 km) |
