| Osterwieck to Navodari | 975.69 mi (1,570.22 km) |
| Osterwieck to Negresti-Oas | 631.08 mi (1,015.63 km) |
| Osterwieck to Nehoiu | 842.87 mi (1,356.46 km) |
| Osterwieck to Ocna Mures | 706.11 mi (1,136.38 km) |
| Osterwieck to Odobesti | 854.95 mi (1,375.91 km) |
| Osterwieck to Odorheiu Secuiesc | 764.24 mi (1,229.93 km) |
| Osterwieck to Oltenita | 911.95 mi (1,467.64 km) |
| Osterwieck to Onesti | 823.69 mi (1,325.60 km) |
| Osterwieck to Oradea | 604.72 mi (973.21 km) |
| Osterwieck to Orastie | 705.52 mi (1,135.42 km) |
| Osterwieck to Oravita | 692.28 mi (1,114.12 km) |
| Osterwieck to Orsova | 731.84 mi (1,177.79 km) |
| Osterwieck to Otelu Rosu | 691.07 mi (1,112.17 km) |
| Osterwieck to Otopeni | 869.72 mi (1,399.68 km) |
| Osterwieck to Ovidiu | 975.88 mi (1,570.53 km) |
