| Swansea to Opwijk | 4,378.17 mi (7,045.99 km) |
| Swansea to Ostend | 4,321.49 mi (6,954.76 km) |
| Swansea to Oud-Heverlee | 4,401.05 mi (7,082.80 km) |
| Swansea to Oud-Turnhout | 4,396.50 mi (7,075.49 km) |
| Swansea to Oudenaarde | 4,359.88 mi (7,016.55 km) |
| Swansea to Oudenburg | 4,325.95 mi (6,961.95 km) |
| Swansea to Oupeye | 4,442.33 mi (7,149.24 km) |
| Swansea to Overijse | 4,397.69 mi (7,077.39 km) |
| Swansea to Overpelt | 4,416.20 mi (7,107.19 km) |
| Swansea to Paal | 4,413.13 mi (7,102.25 km) |
| Swansea to Peer | 4,420.48 mi (7,114.07 km) |
| Swansea to Pepinster | 4,453.84 mi (7,167.76 km) |
| Swansea to Peruwelz | 4,370.41 mi (7,033.49 km) |
| Swansea to Perwez | 4,413.84 mi (7,103.39 km) |
| Swansea to Philippeville | 4,418.27 mi (7,110.52 km) |
