| Piraeus to Opwijk | 1,308.19 mi (2,105.33 km) |
| Piraeus to Ostend | 1,363.36 mi (2,194.11 km) |
| Piraeus to Oud-Heverlee | 1,285.75 mi (2,069.21 km) |
| Piraeus to Oud-Turnhout | 1,295.10 mi (2,084.27 km) |
| Piraeus to Oudenaarde | 1,324.29 mi (2,131.24 km) |
| Piraeus to Oudenburg | 1,358.82 mi (2,186.81 km) |
| Piraeus to Oupeye | 1,246.57 mi (2,006.17 km) |
| Piraeus to Overijse | 1,288.39 mi (2,073.47 km) |
| Piraeus to Overpelt | 1,276.14 mi (2,053.75 km) |
| Piraeus to Paal | 1,276.81 mi (2,054.83 km) |
| Piraeus to Peer | 1,271.27 mi (2,045.91 km) |
| Piraeus to Pepinster | 1,234.55 mi (1,986.82 km) |
| Piraeus to Peruwelz | 1,311.96 mi (2,111.40 km) |
| Piraeus to Perwez | 1,271.95 mi (2,047.01 km) |
| Piraeus to Philippeville | 1,264.43 mi (2,034.90 km) |
