| Heidelberg to Opwijk | 227.28 mi (365.78 km) |
| Heidelberg to Ostend | 284.55 mi (457.94 km) |
| Heidelberg to Oud-Heverlee | 204.32 mi (328.83 km) |
| Heidelberg to Oud-Turnhout | 210.45 mi (338.68 km) |
| Heidelberg to Oudenaarde | 247.24 mi (397.89 km) |
| Heidelberg to Oudenburg | 280.17 mi (450.90 km) |
| Heidelberg to Oupeye | 162.92 mi (262.19 km) |
| Heidelberg to Overijse | 208.02 mi (334.78 km) |
| Heidelberg to Overpelt | 191.45 mi (308.10 km) |
| Heidelberg to Paal | 192.59 mi (309.95 km) |
| Heidelberg to Peer | 186.57 mi (300.26 km) |
| Heidelberg to Pepinster | 151.34 mi (243.55 km) |
| Heidelberg to Peruwelz | 240.41 mi (386.90 km) |
| Heidelberg to Perwez | 192.22 mi (309.35 km) |
| Heidelberg to Philippeville | 193.48 mi (311.38 km) |
