| Duffel to Navodari | 1,207.26 mi (1,942.90 km) |
| Duffel to Negresti-Oas | 874.84 mi (1,407.92 km) |
| Duffel to Nehoiu | 1,073.63 mi (1,727.85 km) |
| Duffel to Ocna Mures | 936.09 mi (1,506.50 km) |
| Duffel to Odobesti | 1,092.24 mi (1,757.78 km) |
| Duffel to Odorheiu Secuiesc | 999.68 mi (1,608.83 km) |
| Duffel to Oltenita | 1,133.06 mi (1,823.49 km) |
| Duffel to Onesti | 1,064.02 mi (1,712.38 km) |
| Duffel to Oradea | 832.89 mi (1,340.40 km) |
| Duffel to Orastie | 926.20 mi (1,490.57 km) |
| Duffel to Oravita | 893.45 mi (1,437.86 km) |
| Duffel to Orsova | 934.46 mi (1,503.87 km) |
| Duffel to Otelu Rosu | 902.76 mi (1,452.85 km) |
| Duffel to Otopeni | 1,092.21 mi (1,757.74 km) |
| Duffel to Ovidiu | 1,206.85 mi (1,942.24 km) |
