| Mechernich to Octeville | 373.34 mi (600.83 km) |
| Mechernich to Oignies | 160.81 mi (258.81 km) |
| Mechernich to Oissel | 261.79 mi (421.31 km) |
| Mechernich to Olivet | 285.65 mi (459.71 km) |
| Mechernich to Ollioules | 516.86 mi (831.81 km) |
| Mechernich to Olonne-sur-Mer | 476.12 mi (766.24 km) |
| Mechernich to Oloron-Sainte-Marie | 615.14 mi (989.97 km) |
| Mechernich to Onet Village | 470.38 mi (757.00 km) |
| Mechernich to Onnaing | 134.93 mi (217.15 km) |
| Mechernich to Orange | 454.65 mi (731.69 km) |
| Mechernich to Orchies | 149.80 mi (241.08 km) |
| Mechernich to Orleans | 283.55 mi (456.32 km) |
| Mechernich to Orly | 229.47 mi (369.30 km) |
| Mechernich to Ormesson-sur-Marne | 222.40 mi (357.92 km) |
| Mechernich to Orsay | 238.94 mi (384.53 km) |
