| Formia to Sestao | 859.78 mi (1,383.68 km) |
| Formia to Sevilla | 1,082.66 mi (1,742.37 km) |
| Formia to Sevilla La Nueva | 923.40 mi (1,486.07 km) |
| Formia to Silla | 749.76 mi (1,206.62 km) |
| Formia to Silleda | 1,123.42 mi (1,807.97 km) |
| Formia to Sitges | 613.15 mi (986.77 km) |
| Formia to Socuellamos | 874.35 mi (1,407.14 km) |
| Formia to Soller | 582.29 mi (937.10 km) |
| Formia to Solsona | 626.32 mi (1,007.97 km) |
| Formia to Son Servera | 550.83 mi (886.48 km) |
| Formia to Sonseca | 927.88 mi (1,493.27 km) |
| Formia to Sopelana | 858.79 mi (1,382.09 km) |
| Formia to Soria | 831.57 mi (1,338.28 km) |
| Formia to Suances | 912.66 mi (1,468.78 km) |
| Formia to Sueca | 747.49 mi (1,202.97 km) |
