| Donostia to Siran | 2,108.34 mi (3,393.04 km) |
| Donostia to Sirnak | 2,343.44 mi (3,771.41 km) |
| Donostia to Sirvan | 2,306.78 mi (3,712.41 km) |
| Donostia to Sivas | 2,013.44 mi (3,240.32 km) |
| Donostia to Sivasli | 1,676.43 mi (2,697.95 km) |
| Donostia to Siverek | 2,179.66 mi (3,507.83 km) |
| Donostia to Sivrice | 2,160.70 mi (3,477.31 km) |
| Donostia to Sivrihisar | 1,746.02 mi (2,809.95 km) |
| Donostia to Sogut | 1,665.06 mi (2,679.65 km) |
| Donostia to Sogutlu | 1,661.82 mi (2,674.44 km) |
| Donostia to Soke | 1,581.64 mi (2,545.41 km) |
| Donostia to Solhan | 2,234.17 mi (3,595.56 km) |
| Donostia to Soma | 1,554.76 mi (2,502.14 km) |
| Donostia to Sorgun | 1,920.65 mi (3,090.99 km) |
| Donostia to Suhut | 1,718.57 mi (2,765.77 km) |
