| Montabaur to Navodari | 1,055.82 mi (1,699.18 km) |
| Montabaur to Negresti-Oas | 725.38 mi (1,167.38 km) |
| Montabaur to Nehoiu | 922.23 mi (1,484.19 km) |
| Montabaur to Ocna Mures | 784.77 mi (1,262.97 km) |
| Montabaur to Odobesti | 941.35 mi (1,514.96 km) |
| Montabaur to Odorheiu Secuiesc | 848.73 mi (1,365.90 km) |
| Montabaur to Oltenita | 981.41 mi (1,579.43 km) |
| Montabaur to Onesti | 913.56 mi (1,470.23 km) |
| Montabaur to Oradea | 681.59 mi (1,096.91 km) |
| Montabaur to Orastie | 774.55 mi (1,246.51 km) |
| Montabaur to Oravita | 742.47 mi (1,194.89 km) |
| Montabaur to Orsova | 783.45 mi (1,260.84 km) |
| Montabaur to Otelu Rosu | 751.22 mi (1,208.96 km) |
| Montabaur to Otopeni | 940.55 mi (1,513.68 km) |
| Montabaur to Ovidiu | 1,055.38 mi (1,698.47 km) |
