| Merthyr Tudful to Santarem | 901.12 mi (1,450.20 km) |
| Merthyr Tudful to Santiago do Cacem | 982.87 mi (1,581.77 km) |
| Merthyr Tudful to Santo Andre | 981.27 mi (1,579.20 km) |
| Merthyr Tudful to Santo Tirso | 758.34 mi (1,220.43 km) |
| Merthyr Tudful to Sao Bras de Alportel | 1,031.97 mi (1,660.79 km) |
| Merthyr Tudful to Sao Felix da Marinha | 780.49 mi (1,256.07 km) |
| Merthyr Tudful to Sao Joao da Madeira | 787.56 mi (1,267.46 km) |
| Merthyr Tudful to Sao Joao de Ver | 784.71 mi (1,262.86 km) |
| Merthyr Tudful to Sao Mamede de Infesta | 769.16 mi (1,237.85 km) |
| Merthyr Tudful to Sao Pedro do Sul | 791.47 mi (1,273.75 km) |
| Merthyr Tudful to Satao | 788.29 mi (1,268.63 km) |
| Merthyr Tudful to Seia | 808.82 mi (1,301.67 km) |
| Merthyr Tudful to Senhora da Hora | 770.86 mi (1,240.59 km) |
| Merthyr Tudful to Serpa | 975.11 mi (1,569.29 km) |
| Merthyr Tudful to Serta | 855.52 mi (1,376.83 km) |
