| Oostakker to Oignies | 55.14 mi (88.73 km) |
| Oostakker to Oissel | 169.52 mi (272.81 km) |
| Oostakker to Olivet | 238.75 mi (384.23 km) |
| Oostakker to Ollioules | 558.59 mi (898.96 km) |
| Oostakker to Olonne-sur-Mer | 403.43 mi (649.26 km) |
| Oostakker to Oloron-Sainte-Marie | 583.35 mi (938.81 km) |
| Oostakker to Onet Village | 468.47 mi (753.93 km) |
| Oostakker to Onnaing | 49.76 mi (80.08 km) |
| Oostakker to Orange | 483.44 mi (778.02 km) |
| Oostakker to Orchies | 48.86 mi (78.64 km) |
| Oostakker to Orleans | 236.11 mi (379.98 km) |
| Oostakker to Orly | 173.88 mi (279.83 km) |
| Oostakker to Ormesson-sur-Marne | 168.96 mi (271.92 km) |
| Oostakker to Orsay | 180.21 mi (290.03 km) |
| Oostakker to Orthez | 567.01 mi (912.52 km) |
