| Mortsel to Oignies | 80.36 mi (129.32 km) |
| Mortsel to Oissel | 195.23 mi (314.20 km) |
| Mortsel to Olivet | 255.55 mi (411.27 km) |
| Mortsel to Ollioules | 558.38 mi (898.63 km) |
| Mortsel to Olonne-sur-Mer | 427.29 mi (687.65 km) |
| Mortsel to Oloron-Sainte-Marie | 599.81 mi (965.29 km) |
| Mortsel to Onet Village | 477.85 mi (769.03 km) |
| Mortsel to Onnaing | 65.85 mi (105.98 km) |
| Mortsel to Orange | 485.88 mi (781.94 km) |
| Mortsel to Orchies | 71.65 mi (115.30 km) |
| Mortsel to Orleans | 252.98 mi (407.14 km) |
| Mortsel to Orly | 191.09 mi (307.53 km) |
| Mortsel to Ormesson-sur-Marne | 185.47 mi (298.48 km) |
| Mortsel to Orsay | 198.39 mi (319.28 km) |
| Mortsel to Orthez | 584.13 mi (940.06 km) |
