| Helensburgh to Opwijk | 505.32 mi (813.23 km) |
| Helensburgh to Ostend | 455.47 mi (733.01 km) |
| Helensburgh to Oud-Heverlee | 526.46 mi (847.25 km) |
| Helensburgh to Oud-Turnhout | 512.68 mi (825.08 km) |
| Helensburgh to Oudenaarde | 494.42 mi (795.69 km) |
| Helensburgh to Oudenburg | 459.97 mi (740.25 km) |
| Helensburgh to Oupeye | 562.49 mi (905.24 km) |
| Helensburgh to Overijse | 524.99 mi (844.89 km) |
| Helensburgh to Overpelt | 531.12 mi (854.75 km) |
| Helensburgh to Paal | 531.85 mi (855.92 km) |
| Helensburgh to Peer | 536.23 mi (862.98 km) |
| Helensburgh to Pepinster | 574.79 mi (925.03 km) |
| Helensburgh to Peruwelz | 511.67 mi (823.45 km) |
| Helensburgh to Perwez | 541.44 mi (871.36 km) |
| Helensburgh to Philippeville | 555.66 mi (894.25 km) |
