| Sankt Gallen to Opwijk | 338.61 mi (544.95 km) |
| Sankt Gallen to Ostend | 391.39 mi (629.89 km) |
| Sankt Gallen to Oud-Heverlee | 317.23 mi (510.53 km) |
| Sankt Gallen to Oud-Turnhout | 333.48 mi (536.69 km) |
| Sankt Gallen to Oudenaarde | 352.06 mi (566.58 km) |
| Sankt Gallen to Oudenburg | 386.83 mi (622.55 km) |
| Sankt Gallen to Oupeye | 282.70 mi (454.96 km) |
| Sankt Gallen to Overijse | 318.85 mi (513.14 km) |
| Sankt Gallen to Overpelt | 316.72 mi (509.71 km) |
| Sankt Gallen to Paal | 313.36 mi (504.30 km) |
| Sankt Gallen to Peer | 311.08 mi (500.64 km) |
| Sankt Gallen to Pepinster | 270.31 mi (435.02 km) |
| Sankt Gallen to Peruwelz | 338.30 mi (544.44 km) |
| Sankt Gallen to Perwez | 302.36 mi (486.59 km) |
| Sankt Gallen to Philippeville | 291.26 mi (468.74 km) |
