| Merthyr Tudful to Santa Ursula | 1,747.68 mi (2,812.62 km) |
| Merthyr Tudful to Santander | 572.45 mi (921.27 km) |
| Merthyr Tudful to Santany | 911.14 mi (1,466.33 km) |
| Merthyr Tudful to Santiago de Compostela | 658.19 mi (1,059.26 km) |
| Merthyr Tudful to Santiago del Teide | 1,762.63 mi (2,836.69 km) |
| Merthyr Tudful to Santiponce | 997.05 mi (1,604.60 km) |
| Merthyr Tudful to Santomera | 952.00 mi (1,532.10 km) |
| Merthyr Tudful to Santona | 573.60 mi (923.11 km) |
| Merthyr Tudful to Santurce-Antiguo | 581.48 mi (935.81 km) |
| Merthyr Tudful to Sarria | 647.11 mi (1,041.42 km) |
| Merthyr Tudful to Sauzal | 1,743.00 mi (2,805.09 km) |
| Merthyr Tudful to Sedavi | 862.97 mi (1,388.82 km) |
| Merthyr Tudful to Segorbe | 833.12 mi (1,340.77 km) |
| Merthyr Tudful to Segovia | 746.68 mi (1,201.67 km) |
| Merthyr Tudful to Senmanat | 746.88 mi (1,201.98 km) |
