| Castelldefels to Opwijk | 677.49 mi (1,090.32 km) |
| Castelldefels to Ostend | 688.65 mi (1,108.27 km) |
| Castelldefels to Oud-Heverlee | 672.43 mi (1,082.17 km) |
| Castelldefels to Oud-Turnhout | 708.00 mi (1,139.42 km) |
| Castelldefels to Oudenaarde | 665.74 mi (1,071.41 km) |
| Castelldefels to Oudenburg | 685.98 mi (1,103.98 km) |
| Castelldefels to Oupeye | 674.56 mi (1,085.61 km) |
| Castelldefels to Overijse | 667.86 mi (1,074.81 km) |
| Castelldefels to Overpelt | 705.75 mi (1,135.80 km) |
| Castelldefels to Paal | 691.25 mi (1,112.46 km) |
| Castelldefels to Peer | 700.56 mi (1,127.44 km) |
| Castelldefels to Pepinster | 667.42 mi (1,074.12 km) |
| Castelldefels to Peruwelz | 642.81 mi (1,034.50 km) |
| Castelldefels to Perwez | 659.72 mi (1,061.72 km) |
| Castelldefels to Philippeville | 628.58 mi (1,011.60 km) |
