| Rhondda to Octeville | 157.90 mi (254.12 km) |
| Rhondda to Oignies | 289.45 mi (465.83 km) |
| Rhondda to Oissel | 252.88 mi (406.97 km) |
| Rhondda to Olivet | 351.38 mi (565.49 km) |
| Rhondda to Ollioules | 727.40 mi (1,170.64 km) |
| Rhondda to Olonne-sur-Mer | 358.76 mi (577.37 km) |
| Rhondda to Oloron-Sainte-Marie | 596.42 mi (959.85 km) |
| Rhondda to Onet Village | 572.44 mi (921.25 km) |
| Rhondda to Onnaing | 316.48 mi (509.32 km) |
| Rhondda to Orange | 641.24 mi (1,031.98 km) |
| Rhondda to Orchies | 299.81 mi (482.50 km) |
| Rhondda to Orleans | 349.61 mi (562.64 km) |
| Rhondda to Orly | 324.59 mi (522.38 km) |
| Rhondda to Ormesson-sur-Marne | 327.88 mi (527.67 km) |
| Rhondda to Orsay | 319.54 mi (514.25 km) |
