| Douai to Oignies | 7.75 mi (12.48 km) |
| Douai to Oissel | 113.60 mi (182.82 km) |
| Douai to Olivet | 181.27 mi (291.72 km) |
| Douai to Ollioules | 516.46 mi (831.17 km) |
| Douai to Olonne-sur-Mer | 345.79 mi (556.49 km) |
| Douai to Oloron-Sainte-Marie | 525.51 mi (845.72 km) |
| Douai to Onet Village | 415.58 mi (668.81 km) |
| Douai to Onnaing | 22.86 mi (36.78 km) |
| Douai to Orange | 438.20 mi (705.22 km) |
| Douai to Orchies | 10.16 mi (16.35 km) |
| Douai to Orleans | 178.60 mi (287.43 km) |
| Douai to Orly | 116.59 mi (187.63 km) |
| Douai to Ormesson-sur-Marne | 112.21 mi (180.58 km) |
| Douai to Orsay | 122.34 mi (196.89 km) |
| Douai to Orthez | 508.94 mi (819.05 km) |
