| Merthyr Tudful to Irun | 585.42 mi (942.14 km) |
| Merthyr Tudful to Isla-Cristina | 1,023.13 mi (1,646.56 km) |
| Merthyr Tudful to Jaca | 648.80 mi (1,044.14 km) |
| Merthyr Tudful to Jaen | 965.86 mi (1,554.40 km) |
| Merthyr Tudful to Jerez de la Frontera | 1,049.37 mi (1,688.80 km) |
| Merthyr Tudful to Jerez de los Caballeros | 941.83 mi (1,515.74 km) |
| Merthyr Tudful to Jodar | 961.07 mi (1,546.69 km) |
| Merthyr Tudful to Jumilla | 921.79 mi (1,483.48 km) |
| Merthyr Tudful to La Algaba | 995.77 mi (1,602.54 km) |
| Merthyr Tudful to La Baneza | 663.25 mi (1,067.40 km) |
| Merthyr Tudful to La Carlota | 975.51 mi (1,569.94 km) |
| Merthyr Tudful to La Carolina | 931.19 mi (1,498.61 km) |
| Merthyr Tudful to La Corredoria | 588.49 mi (947.09 km) |
| Merthyr Tudful to La Eliana | 852.35 mi (1,371.73 km) |
| Merthyr Tudful to La Escala | 732.16 mi (1,178.30 km) |
