| Merthyr Tudful to Oliveira de Frades | 795.26 mi (1,279.85 km) |
| Merthyr Tudful to Oliveira do Bairro | 813.00 mi (1,308.39 km) |
| Merthyr Tudful to Oliveira do Hospital | 815.03 mi (1,311.66 km) |
| Merthyr Tudful to Ourem | 871.69 mi (1,402.85 km) |
| Merthyr Tudful to Ovar | 791.71 mi (1,274.14 km) |
| Merthyr Tudful to Pacos de Ferreira | 761.76 mi (1,225.93 km) |
| Merthyr Tudful to Palmela | 948.62 mi (1,526.66 km) |
| Merthyr Tudful to Paredes | 765.21 mi (1,231.48 km) |
| Merthyr Tudful to Paredes de Coura | 721.60 mi (1,161.31 km) |
| Merthyr Tudful to Penacova | 826.40 mi (1,329.96 km) |
| Merthyr Tudful to Penafiel | 764.10 mi (1,229.70 km) |
| Merthyr Tudful to Peniche | 903.21 mi (1,453.57 km) |
| Merthyr Tudful to Peso da Regua | 759.88 mi (1,222.91 km) |
| Merthyr Tudful to Pinhal Novo | 944.52 mi (1,520.05 km) |
| Merthyr Tudful to Pinhel | 777.21 mi (1,250.79 km) |
