| Opwijk to Oignies | 62.37 mi (100.37 km) |
| Opwijk to Oissel | 177.00 mi (284.85 km) |
| Opwijk to Olivet | 237.64 mi (382.45 km) |
| Opwijk to Ollioules | 546.42 mi (879.37 km) |
| Opwijk to Olonne-sur-Mer | 408.80 mi (657.90 km) |
| Opwijk to Oloron-Sainte-Marie | 582.09 mi (936.78 km) |
| Opwijk to Onet Village | 462.02 mi (743.55 km) |
| Opwijk to Onnaing | 47.50 mi (76.44 km) |
| Opwijk to Orange | 472.70 mi (760.73 km) |
| Opwijk to Orchies | 53.32 mi (85.81 km) |
| Opwijk to Orleans | 235.06 mi (378.29 km) |
| Opwijk to Orly | 173.04 mi (278.49 km) |
| Opwijk to Ormesson-sur-Marne | 167.53 mi (269.62 km) |
| Opwijk to Orsay | 180.21 mi (290.02 km) |
| Opwijk to Orthez | 566.28 mi (911.33 km) |
