| Zaventem to Oignies | 70.56 mi (113.55 km) |
| Zaventem to Oissel | 183.57 mi (295.43 km) |
| Zaventem to Olivet | 238.40 mi (383.66 km) |
| Zaventem to Ollioules | 538.96 mi (867.37 km) |
| Zaventem to Olonne-sur-Mer | 413.41 mi (665.32 km) |
| Zaventem to Oloron-Sainte-Marie | 582.16 mi (936.90 km) |
| Zaventem to Onet Village | 458.66 mi (738.14 km) |
| Zaventem to Onnaing | 51.19 mi (82.39 km) |
| Zaventem to Orange | 466.31 mi (750.45 km) |
| Zaventem to Orchies | 60.51 mi (97.38 km) |
| Zaventem to Orleans | 235.86 mi (379.58 km) |
| Zaventem to Orly | 174.34 mi (280.57 km) |
| Zaventem to Ormesson-sur-Marne | 168.47 mi (271.13 km) |
| Zaventem to Orsay | 182.00 mi (292.90 km) |
| Zaventem to Orthez | 566.71 mi (912.04 km) |
