| Donostia to Serik | 1,790.24 mi (2,881.11 km) |
| Donostia to Serinhisar | 1,679.62 mi (2,703.09 km) |
| Donostia to Serinyol | 2,062.54 mi (3,319.33 km) |
| Donostia to Seydisehir | 1,813.75 mi (2,918.95 km) |
| Donostia to Seyhan | 2,001.02 mi (3,220.33 km) |
| Donostia to Seyitgazi | 1,703.74 mi (2,741.91 km) |
| Donostia to Siirt | 2,306.49 mi (3,711.94 km) |
| Donostia to Sile | 1,612.92 mi (2,595.75 km) |
| Donostia to Silifke | 1,948.29 mi (3,135.47 km) |
| Donostia to Silivri | 1,546.53 mi (2,488.90 km) |
| Donostia to Silopi | 2,351.72 mi (3,784.72 km) |
| Donostia to Simav | 1,626.36 mi (2,617.37 km) |
| Donostia to Sinanpasa | 1,698.20 mi (2,732.98 km) |
| Donostia to Sindirgi | 1,581.98 mi (2,545.96 km) |
| Donostia to Sinop | 1,872.75 mi (3,013.91 km) |
