| Bad Oeynhausen to Navodari | 1,056.46 mi (1,700.21 km) |
| Bad Oeynhausen to Negresti-Oas | 713.00 mi (1,147.46 km) |
| Bad Oeynhausen to Nehoiu | 923.35 mi (1,485.98 km) |
| Bad Oeynhausen to Ocna Mures | 786.22 mi (1,265.29 km) |
| Bad Oeynhausen to Odobesti | 936.35 mi (1,506.91 km) |
| Bad Oeynhausen to Odorheiu Secuiesc | 845.28 mi (1,360.34 km) |
| Bad Oeynhausen to Oltenita | 991.01 mi (1,594.87 km) |
| Bad Oeynhausen to Onesti | 905.44 mi (1,457.16 km) |
| Bad Oeynhausen to Oradea | 684.25 mi (1,101.19 km) |
| Bad Oeynhausen to Orastie | 784.02 mi (1,261.76 km) |
| Bad Oeynhausen to Oravita | 766.85 mi (1,234.13 km) |
| Bad Oeynhausen to Orsova | 806.90 mi (1,298.57 km) |
| Bad Oeynhausen to Otelu Rosu | 767.81 mi (1,235.67 km) |
| Bad Oeynhausen to Otopeni | 948.93 mi (1,527.16 km) |
| Bad Oeynhausen to Ovidiu | 1,056.56 mi (1,700.38 km) |
