| Westerlo to Oignies | 94.12 mi (151.48 km) |
| Westerlo to Oissel | 207.52 mi (333.98 km) |
| Westerlo to Olivet | 260.36 mi (419.01 km) |
| Westerlo to Ollioules | 550.60 mi (886.10 km) |
| Westerlo to Olonne-sur-Mer | 437.11 mi (703.46 km) |
| Westerlo to Oloron-Sainte-Marie | 603.32 mi (970.96 km) |
| Westerlo to Onet Village | 476.48 mi (766.81 km) |
| Westerlo to Onnaing | 75.06 mi (120.79 km) |
| Westerlo to Orange | 479.88 mi (772.29 km) |
| Westerlo to Orchies | 84.30 mi (135.67 km) |
| Westerlo to Orleans | 257.86 mi (414.99 km) |
| Westerlo to Orly | 196.79 mi (316.70 km) |
| Westerlo to Ormesson-sur-Marne | 190.73 mi (306.95 km) |
| Westerlo to Orsay | 204.71 mi (329.45 km) |
| Westerlo to Orthez | 588.17 mi (946.57 km) |
