| Tournai to Oignies | 19.72 mi (31.74 km) |
| Tournai to Oissel | 134.30 mi (216.13 km) |
| Tournai to Olivet | 200.96 mi (323.41 km) |
| Tournai to Ollioules | 528.70 mi (850.85 km) |
| Tournai to Olonne-sur-Mer | 366.87 mi (590.43 km) |
| Tournai to Oloron-Sainte-Marie | 545.49 mi (877.89 km) |
| Tournai to Onet Village | 432.73 mi (696.41 km) |
| Tournai to Onnaing | 17.65 mi (28.41 km) |
| Tournai to Orange | 451.75 mi (727.02 km) |
| Tournai to Orchies | 11.03 mi (17.76 km) |
| Tournai to Orleans | 198.31 mi (319.15 km) |
| Tournai to Orly | 136.11 mi (219.04 km) |
| Tournai to Ormesson-sur-Marne | 131.34 mi (211.38 km) |
| Tournai to Orsay | 142.31 mi (229.03 km) |
| Tournai to Orthez | 529.10 mi (851.51 km) |
