| Irthlingborough to Opwijk | 225.99 mi (363.70 km) |
| Irthlingborough to Ostend | 169.02 mi (272.01 km) |
| Irthlingborough to Oud-Heverlee | 248.96 mi (400.66 km) |
| Irthlingborough to Oud-Turnhout | 248.90 mi (400.57 km) |
| Irthlingborough to Oudenaarde | 207.56 mi (334.03 km) |
| Irthlingborough to Oudenburg | 173.48 mi (279.19 km) |
| Irthlingborough to Oupeye | 291.15 mi (468.56 km) |
| Irthlingborough to Overijse | 245.35 mi (394.85 km) |
| Irthlingborough to Overpelt | 268.87 mi (432.70 km) |
| Irthlingborough to Paal | 263.23 mi (423.63 km) |
| Irthlingborough to Peer | 272.30 mi (438.23 km) |
| Irthlingborough to Pepinster | 302.24 mi (486.40 km) |
| Irthlingborough to Peruwelz | 219.71 mi (353.60 km) |
| Irthlingborough to Perwez | 261.41 mi (420.70 km) |
| Irthlingborough to Philippeville | 267.08 mi (429.83 km) |
