| Viana do Castelo to Opwijk | 889.42 mi (1,431.38 km) |
| Viana do Castelo to Ostend | 861.60 mi (1,386.62 km) |
| Viana do Castelo to Oud-Heverlee | 899.58 mi (1,447.73 km) |
| Viana do Castelo to Oud-Turnhout | 931.49 mi (1,499.09 km) |
| Viana do Castelo to Oudenaarde | 865.06 mi (1,392.17 km) |
| Viana do Castelo to Oudenburg | 861.99 mi (1,387.24 km) |
| Viana do Castelo to Oupeye | 927.93 mi (1,493.36 km) |
| Viana do Castelo to Overijse | 892.88 mi (1,436.96 km) |
| Viana do Castelo to Overpelt | 941.58 mi (1,515.32 km) |
| Viana do Castelo to Paal | 925.65 mi (1,489.70 km) |
| Viana do Castelo to Peer | 939.22 mi (1,511.52 km) |
| Viana do Castelo to Pepinster | 928.32 mi (1,493.98 km) |
| Viana do Castelo to Peruwelz | 849.22 mi (1,366.69 km) |
| Viana do Castelo to Perwez | 895.58 mi (1,441.30 km) |
| Viana do Castelo to Philippeville | 868.39 mi (1,397.54 km) |
