| Caister-on-Sea to Opwijk | 156.51 mi (251.87 km) |
| Caister-on-Sea to Ostend | 110.68 mi (178.12 km) |
| Caister-on-Sea to Oud-Heverlee | 177.53 mi (285.70 km) |
| Caister-on-Sea to Oud-Turnhout | 166.20 mi (267.47 km) |
| Caister-on-Sea to Oudenaarde | 147.85 mi (237.94 km) |
| Caister-on-Sea to Oudenburg | 114.88 mi (184.89 km) |
| Caister-on-Sea to Oupeye | 214.61 mi (345.38 km) |
| Caister-on-Sea to Overijse | 176.10 mi (283.41 km) |
| Caister-on-Sea to Overpelt | 185.57 mi (298.64 km) |
| Caister-on-Sea to Paal | 184.25 mi (296.52 km) |
| Caister-on-Sea to Peer | 190.15 mi (306.02 km) |
| Caister-on-Sea to Pepinster | 226.75 mi (364.92 km) |
| Caister-on-Sea to Peruwelz | 167.49 mi (269.54 km) |
| Caister-on-Sea to Perwez | 192.53 mi (309.84 km) |
| Caister-on-Sea to Philippeville | 208.31 mi (335.24 km) |
