| Alcacer do Sal to Opwijk | 1,067.46 mi (1,717.92 km) |
| Alcacer do Sal to Ostend | 1,047.44 mi (1,685.69 km) |
| Alcacer do Sal to Oud-Heverlee | 1,074.35 mi (1,729.00 km) |
| Alcacer do Sal to Oud-Turnhout | 1,108.44 mi (1,783.87 km) |
| Alcacer do Sal to Oudenaarde | 1,045.03 mi (1,681.81 km) |
| Alcacer do Sal to Oudenburg | 1,047.16 mi (1,685.24 km) |
| Alcacer do Sal to Oupeye | 1,097.24 mi (1,765.83 km) |
| Alcacer do Sal to Overijse | 1,067.90 mi (1,718.61 km) |
| Alcacer do Sal to Overpelt | 1,115.88 mi (1,795.83 km) |
| Alcacer do Sal to Paal | 1,099.69 mi (1,769.78 km) |
| Alcacer do Sal to Peer | 1,112.72 mi (1,790.74 km) |
| Alcacer do Sal to Pepinster | 1,095.67 mi (1,763.31 km) |
| Alcacer do Sal to Peruwelz | 1,026.78 mi (1,652.45 km) |
| Alcacer do Sal to Perwez | 1,068.02 mi (1,718.80 km) |
| Alcacer do Sal to Philippeville | 1,038.61 mi (1,671.48 km) |
