| Merthyr Tudful to Redondela | 698.19 mi (1,123.62 km) |
| Merthyr Tudful to Reinosa | 604.99 mi (973.63 km) |
| Merthyr Tudful to Requena | 853.87 mi (1,374.18 km) |
| Merthyr Tudful to Reus | 761.73 mi (1,225.89 km) |
| Merthyr Tudful to Rianxo | 677.70 mi (1,090.65 km) |
| Merthyr Tudful to Ribadeo | 592.09 mi (952.87 km) |
| Merthyr Tudful to Rincon de la Victoria | 1,039.16 mi (1,672.37 km) |
| Merthyr Tudful to Ripoll | 709.11 mi (1,141.20 km) |
| Merthyr Tudful to Ripollet | 754.55 mi (1,214.33 km) |
| Merthyr Tudful to Rojales | 952.16 mi (1,532.35 km) |
| Merthyr Tudful to Ronda | 1,040.48 mi (1,674.49 km) |
| Merthyr Tudful to Roquetas de Mar | 1,035.61 mi (1,666.65 km) |
| Merthyr Tudful to Rosas | 723.41 mi (1,164.21 km) |
| Merthyr Tudful to Rubi | 752.77 mi (1,211.47 km) |
| Merthyr Tudful to Rute | 997.93 mi (1,606.01 km) |
