| Pen-y-Bont ar Ogwr to Octeville | 155.20 mi (249.77 km) |
| Pen-y-Bont ar Ogwr to Oignies | 294.58 mi (474.08 km) |
| Pen-y-Bont ar Ogwr to Oissel | 254.16 mi (409.03 km) |
| Pen-y-Bont ar Ogwr to Olivet | 351.03 mi (564.93 km) |
| Pen-y-Bont ar Ogwr to Ollioules | 726.17 mi (1,168.66 km) |
| Pen-y-Bont ar Ogwr to Olonne-sur-Mer | 353.05 mi (568.18 km) |
| Pen-y-Bont ar Ogwr to Oloron-Sainte-Marie | 590.85 mi (950.87 km) |
| Pen-y-Bont ar Ogwr to Onet Village | 569.71 mi (916.85 km) |
| Pen-y-Bont ar Ogwr to Onnaing | 321.69 mi (517.70 km) |
| Pen-y-Bont ar Ogwr to Orange | 639.94 mi (1,029.89 km) |
| Pen-y-Bont ar Ogwr to Orchies | 305.05 mi (490.93 km) |
| Pen-y-Bont ar Ogwr to Orleans | 349.32 mi (562.18 km) |
| Pen-y-Bont ar Ogwr to Orly | 326.04 mi (524.72 km) |
| Pen-y-Bont ar Ogwr to Ormesson-sur-Marne | 329.53 mi (530.33 km) |
| Pen-y-Bont ar Ogwr to Orsay | 320.73 mi (516.16 km) |
