| Formia to Somma Lombardo | 392.13 mi (631.07 km) |
| Formia to Somma Vesuviana | 50.67 mi (81.54 km) |
| Formia to Sommacampagna | 317.58 mi (511.10 km) |
| Formia to Sona | 320.00 mi (514.99 km) |
| Formia to Sondrio | 386.89 mi (622.63 km) |
| Formia to Sora | 31.09 mi (50.04 km) |
| Formia to Sorbolo | 294.48 mi (473.92 km) |
| Formia to Soresina | 335.93 mi (540.63 km) |
| Formia to Sorisole | 367.06 mi (590.72 km) |
| Formia to Sorrento | 59.24 mi (95.33 km) |
| Formia to Sorso | 264.60 mi (425.84 km) |
| Formia to Sortino | 293.24 mi (471.93 km) |
| Formia to Soverato Marina | 236.57 mi (380.73 km) |
| Formia to Sovicille | 185.08 mi (297.86 km) |
| Formia to Spello | 128.46 mi (206.73 km) |
