| Calahorra to Opwijk | 665.55 mi (1,071.10 km) |
| Calahorra to Ostend | 658.27 mi (1,059.39 km) |
| Calahorra to Oud-Heverlee | 667.87 mi (1,074.84 km) |
| Calahorra to Oud-Turnhout | 703.63 mi (1,132.38 km) |
| Calahorra to Oudenaarde | 646.75 mi (1,040.85 km) |
| Calahorra to Oudenburg | 656.90 mi (1,057.18 km) |
| Calahorra to Oupeye | 683.64 mi (1,100.21 km) |
| Calahorra to Overijse | 661.95 mi (1,065.30 km) |
| Calahorra to Overpelt | 707.48 mi (1,138.58 km) |
| Calahorra to Paal | 691.47 mi (1,112.81 km) |
| Calahorra to Peer | 703.45 mi (1,132.09 km) |
| Calahorra to Pepinster | 680.05 mi (1,094.44 km) |
| Calahorra to Peruwelz | 625.84 mi (1,007.18 km) |
| Calahorra to Perwez | 658.87 mi (1,060.35 km) |
| Calahorra to Philippeville | 627.83 mi (1,010.40 km) |
