| Boulder to Redondela | 4,729.82 mi (7,611.92 km) |
| Boulder to Reinosa | 4,884.27 mi (7,860.47 km) |
| Boulder to Requena | 5,158.82 mi (8,302.32 km) |
| Boulder to Reus | 5,173.79 mi (8,326.41 km) |
| Boulder to Rianxo | 4,706.93 mi (7,575.08 km) |
| Boulder to Ribadeo | 4,744.93 mi (7,636.23 km) |
| Boulder to Rincon de la Victoria | 5,145.58 mi (8,281.01 km) |
| Boulder to Ripoll | 5,169.10 mi (8,318.87 km) |
| Boulder to Ripollet | 5,199.65 mi (8,368.03 km) |
| Boulder to Rojales | 5,236.37 mi (8,427.12 km) |
| Boulder to Ronda | 5,106.51 mi (8,218.13 km) |
| Boulder to Roquetas de Mar | 5,215.21 mi (8,393.07 km) |
| Boulder to Rosas | 5,204.26 mi (8,375.45 km) |
| Boulder to Rubi | 5,194.93 mi (8,360.43 km) |
| Boulder to Rute | 5,116.11 mi (8,233.58 km) |
