| Merthyr Tudful to Sereflikochisar | 1,971.07 mi (3,172.13 km) |
| Merthyr Tudful to Serik | 1,961.43 mi (3,156.61 km) |
| Merthyr Tudful to Serinhisar | 1,856.17 mi (2,987.21 km) |
| Merthyr Tudful to Serinyol | 2,197.07 mi (3,535.84 km) |
| Merthyr Tudful to Seydisehir | 1,968.93 mi (3,168.69 km) |
| Merthyr Tudful to Seyhan | 2,132.86 mi (3,432.50 km) |
| Merthyr Tudful to Seyitgazi | 1,830.63 mi (2,946.12 km) |
| Merthyr Tudful to Siirt | 2,370.27 mi (3,814.59 km) |
| Merthyr Tudful to Sile | 1,712.41 mi (2,755.85 km) |
| Merthyr Tudful to Silifke | 2,102.65 mi (3,383.88 km) |
| Merthyr Tudful to Silivri | 1,659.75 mi (2,671.12 km) |
| Merthyr Tudful to Silopi | 2,422.00 mi (3,897.83 km) |
| Merthyr Tudful to Simav | 1,776.02 mi (2,858.23 km) |
| Merthyr Tudful to Sinanpasa | 1,842.91 mi (2,965.87 km) |
| Merthyr Tudful to Sindirgi | 1,735.96 mi (2,793.76 km) |
