| Swansea to Octeville | 4,193.72 mi (6,749.14 km) |
| Swansea to Oignies | 4,349.30 mi (6,999.52 km) |
| Swansea to Oissel | 4,311.89 mi (6,939.31 km) |
| Swansea to Olivet | 4,393.30 mi (7,070.33 km) |
| Swansea to Ollioules | 4,725.91 mi (7,605.62 km) |
| Swansea to Olonne-sur-Mer | 4,285.43 mi (6,896.73 km) |
| Swansea to Oloron-Sainte-Marie | 4,446.71 mi (7,156.28 km) |
| Swansea to Onet Village | 4,543.37 mi (7,311.85 km) |
| Swansea to Onnaing | 4,375.31 mi (7,041.38 km) |
| Swansea to Orange | 4,644.96 mi (7,475.33 km) |
| Swansea to Orchies | 4,358.77 mi (7,014.77 km) |
| Swansea to Orleans | 4,392.33 mi (7,068.78 km) |
| Swansea to Orly | 4,383.41 mi (7,054.42 km) |
| Swansea to Ormesson-sur-Marne | 4,387.79 mi (7,061.46 km) |
| Swansea to Orsay | 4,376.77 mi (7,043.73 km) |
