| Llantrisant to Octeville | 152.57 mi (245.54 km) |
| Llantrisant to Oignies | 286.53 mi (461.13 km) |
| Llantrisant to Oissel | 248.39 mi (399.74 km) |
| Llantrisant to Olivet | 346.46 mi (557.58 km) |
| Llantrisant to Ollioules | 722.32 mi (1,162.46 km) |
| Llantrisant to Olonne-sur-Mer | 353.38 mi (568.71 km) |
| Llantrisant to Oloron-Sainte-Marie | 591.03 mi (951.17 km) |
| Llantrisant to Onet Village | 567.13 mi (912.70 km) |
| Llantrisant to Onnaing | 313.60 mi (504.69 km) |
| Llantrisant to Orange | 636.15 mi (1,023.78 km) |
| Llantrisant to Orchies | 296.95 mi (477.89 km) |
| Llantrisant to Orleans | 344.71 mi (554.75 km) |
| Llantrisant to Orly | 320.16 mi (515.25 km) |
| Llantrisant to Ormesson-sur-Marne | 323.51 mi (520.64 km) |
| Llantrisant to Orsay | 315.03 mi (506.99 km) |
