| Holyhead to Sereflikochisar | 2,046.34 mi (3,293.26 km) |
| Holyhead to Serik | 2,045.74 mi (3,292.31 km) |
| Holyhead to Serinhisar | 1,942.14 mi (3,125.57 km) |
| Holyhead to Serinyol | 2,274.04 mi (3,659.71 km) |
| Holyhead to Seydisehir | 2,050.82 mi (3,300.48 km) |
| Holyhead to Seyhan | 2,209.88 mi (3,556.45 km) |
| Holyhead to Seyitgazi | 1,909.49 mi (3,073.02 km) |
| Holyhead to Siirt | 2,434.35 mi (3,917.70 km) |
| Holyhead to Sile | 1,788.28 mi (2,877.95 km) |
| Holyhead to Silifke | 2,183.37 mi (3,513.79 km) |
| Holyhead to Silivri | 1,738.37 mi (2,797.63 km) |
| Holyhead to Silopi | 2,486.83 mi (4,002.17 km) |
| Holyhead to Simav | 1,858.84 mi (2,991.51 km) |
| Holyhead to Sinanpasa | 1,924.34 mi (3,096.93 km) |
| Holyhead to Sindirgi | 1,819.81 mi (2,928.71 km) |
