| Castel Gandolfo to Somma Lombardo | 335.94 mi (540.65 km) |
| Castel Gandolfo to Somma Vesuviana | 110.60 mi (177.99 km) |
| Castel Gandolfo to Sommacampagna | 268.02 mi (431.33 km) |
| Castel Gandolfo to Sona | 270.46 mi (435.26 km) |
| Castel Gandolfo to Sondrio | 335.39 mi (539.76 km) |
| Castel Gandolfo to Sora | 49.79 mi (80.13 km) |
| Castel Gandolfo to Sorbolo | 241.09 mi (387.99 km) |
| Castel Gandolfo to Soresina | 281.77 mi (453.47 km) |
| Castel Gandolfo to Sorisole | 313.60 mi (504.69 km) |
| Castel Gandolfo to Sorrento | 118.29 mi (190.37 km) |
| Castel Gandolfo to Sorso | 221.49 mi (356.45 km) |
| Castel Gandolfo to Sortino | 340.97 mi (548.74 km) |
| Castel Gandolfo to Soverato Marina | 295.07 mi (474.87 km) |
| Castel Gandolfo to Sovicille | 128.40 mi (206.64 km) |
| Castel Gandolfo to Spello | 85.82 mi (138.11 km) |
