| Formia to Siran | 1,332.97 mi (2,145.21 km) |
| Formia to Sirnak | 1,554.29 mi (2,501.39 km) |
| Formia to Sirvan | 1,520.29 mi (2,446.68 km) |
| Formia to Sivas | 1,229.98 mi (1,979.46 km) |
| Formia to Sivasli | 872.00 mi (1,403.34 km) |
| Formia to Siverek | 1,386.11 mi (2,230.74 km) |
| Formia to Sivrice | 1,371.59 mi (2,207.36 km) |
| Formia to Sivrihisar | 950.12 mi (1,529.07 km) |
| Formia to Sogut | 871.37 mi (1,402.34 km) |
| Formia to Sogutlu | 877.39 mi (1,412.02 km) |
| Formia to Soke | 773.37 mi (1,244.62 km) |
| Formia to Solhan | 1,452.28 mi (2,337.22 km) |
| Formia to Soma | 751.07 mi (1,208.74 km) |
| Formia to Sorgun | 1,134.27 mi (1,825.43 km) |
| Formia to Suhut | 915.47 mi (1,473.30 km) |
