| Watford to Redondela | 753.59 mi (1,212.79 km) |
| Watford to Reinosa | 622.81 mi (1,002.31 km) |
| Watford to Requena | 841.47 mi (1,354.22 km) |
| Watford to Reus | 728.98 mi (1,173.17 km) |
| Watford to Rianxo | 736.26 mi (1,184.89 km) |
| Watford to Ribadeo | 640.26 mi (1,030.39 km) |
| Watford to Rincon de la Victoria | 1,049.57 mi (1,689.11 km) |
| Watford to Ripoll | 664.39 mi (1,069.23 km) |
| Watford to Ripollet | 712.14 mi (1,146.07 km) |
| Watford to Rojales | 937.48 mi (1,508.73 km) |
| Watford to Ronda | 1,056.86 mi (1,700.86 km) |
| Watford to Roquetas de Mar | 1,034.58 mi (1,665.00 km) |
| Watford to Rosas | 670.18 mi (1,078.55 km) |
| Watford to Rubi | 711.41 mi (1,144.90 km) |
| Watford to Rute | 1,009.44 mi (1,624.54 km) |
