| Merthyr Tudful to Sesimbra | 959.59 mi (1,544.31 km) |
| Merthyr Tudful to Setubal | 951.36 mi (1,531.07 km) |
| Merthyr Tudful to Sever do Vouga | 796.70 mi (1,282.16 km) |
| Merthyr Tudful to Silves | 1,035.59 mi (1,666.62 km) |
| Merthyr Tudful to Sines | 989.15 mi (1,591.88 km) |
| Merthyr Tudful to Sintra | 940.06 mi (1,512.88 km) |
| Merthyr Tudful to Sobrado de Paiva | 775.33 mi (1,247.77 km) |
| Merthyr Tudful to Sobral de Monte Agraco | 922.05 mi (1,483.90 km) |
| Merthyr Tudful to Soure | 845.94 mi (1,361.41 km) |
| Merthyr Tudful to Tabua | 817.05 mi (1,314.91 km) |
| Merthyr Tudful to Tavira | 1,031.87 mi (1,660.63 km) |
| Merthyr Tudful to Tomar | 873.02 mi (1,404.99 km) |
| Merthyr Tudful to Tondela | 807.28 mi (1,299.20 km) |
| Merthyr Tudful to Torre de Moncorvo | 749.78 mi (1,206.66 km) |
| Merthyr Tudful to Torres Novas | 883.49 mi (1,421.84 km) |
