| Merthyr Tudful to Benavente | 920.52 mi (1,481.44 km) |
| Merthyr Tudful to Bombarral | 905.47 mi (1,457.22 km) |
| Merthyr Tudful to Bougado | 759.49 mi (1,222.28 km) |
| Merthyr Tudful to Braga | 743.29 mi (1,196.21 km) |
| Merthyr Tudful to Braganca | 704.72 mi (1,134.14 km) |
| Merthyr Tudful to Cabeceiras de Basto | 738.56 mi (1,188.60 km) |
| Merthyr Tudful to Cacem | 940.79 mi (1,514.06 km) |
| Merthyr Tudful to Cadaval | 906.98 mi (1,459.64 km) |
| Merthyr Tudful to Caldas da Rainha | 895.95 mi (1,441.89 km) |
| Merthyr Tudful to Calheta | 1,485.58 mi (2,390.81 km) |
| Merthyr Tudful to Camara de Lobos | 1,483.14 mi (2,386.88 km) |
| Merthyr Tudful to Canico | 1,483.63 mi (2,387.68 km) |
| Merthyr Tudful to Cantanhede | 825.68 mi (1,328.80 km) |
| Merthyr Tudful to Carregal do Sal | 811.78 mi (1,306.44 km) |
| Merthyr Tudful to Cartaxo | 908.05 mi (1,461.36 km) |
