| Oostkamp to Navodari | 1,262.29 mi (2,031.46 km) |
| Oostkamp to Negresti-Oas | 930.46 mi (1,497.43 km) |
| Oostkamp to Nehoiu | 1,128.70 mi (1,816.47 km) |
| Oostkamp to Ocna Mures | 991.22 mi (1,595.21 km) |
| Oostkamp to Odobesti | 1,147.58 mi (1,846.86 km) |
| Oostkamp to Odorheiu Secuiesc | 1,055.00 mi (1,697.86 km) |
| Oostkamp to Oltenita | 1,187.54 mi (1,911.15 km) |
| Oostkamp to Onesti | 1,119.49 mi (1,801.65 km) |
| Oostkamp to Oradea | 888.02 mi (1,429.14 km) |
| Oostkamp to Orastie | 980.85 mi (1,578.53 km) |
| Oostkamp to Oravita | 946.88 mi (1,523.85 km) |
| Oostkamp to Orsova | 987.91 mi (1,589.89 km) |
| Oostkamp to Otelu Rosu | 956.90 mi (1,539.98 km) |
| Oostkamp to Otopeni | 1,146.80 mi (1,845.60 km) |
| Oostkamp to Ovidiu | 1,261.85 mi (2,030.76 km) |
