| Douai to Navodari | 1,258.87 mi (2,025.95 km) |
| Douai to Negresti-Oas | 932.97 mi (1,501.47 km) |
| Douai to Nehoiu | 1,125.66 mi (1,811.57 km) |
| Douai to Ocna Mures | 988.78 mi (1,591.29 km) |
| Douai to Odobesti | 1,146.59 mi (1,845.25 km) |
| Douai to Odorheiu Secuiesc | 1,053.88 mi (1,696.06 km) |
| Douai to Oltenita | 1,181.24 mi (1,901.02 km) |
| Douai to Onesti | 1,119.69 mi (1,801.97 km) |
| Douai to Oradea | 885.87 mi (1,425.67 km) |
| Douai to Orastie | 975.76 mi (1,570.34 km) |
| Douai to Oravita | 936.97 mi (1,507.90 km) |
| Douai to Orsova | 977.99 mi (1,573.92 km) |
| Douai to Otelu Rosu | 949.57 mi (1,528.18 km) |
| Douai to Otopeni | 1,141.13 mi (1,836.48 km) |
| Douai to Ovidiu | 1,258.24 mi (2,024.93 km) |
