| Conwy to Octeville | 269.36 mi (433.50 km) |
| Conwy to Oignies | 349.69 mi (562.76 km) |
| Conwy to Oissel | 345.11 mi (555.39 km) |
| Conwy to Olivet | 450.54 mi (725.07 km) |
| Conwy to Ollioules | 828.68 mi (1,333.63 km) |
| Conwy to Olonne-sur-Mer | 474.81 mi (764.13 km) |
| Conwy to Oloron-Sainte-Marie | 712.28 mi (1,146.31 km) |
| Conwy to Onet Village | 681.07 mi (1,096.07 km) |
| Conwy to Onnaing | 374.57 mi (602.81 km) |
| Conwy to Orange | 743.20 mi (1,196.07 km) |
| Conwy to Orchies | 358.39 mi (576.77 km) |
| Conwy to Orleans | 448.48 mi (721.76 km) |
| Conwy to Orly | 413.70 mi (665.78 km) |
| Conwy to Ormesson-sur-Marne | 415.60 mi (668.84 km) |
| Conwy to Orsay | 410.46 mi (660.57 km) |
