| Oudenburg to Navodari | 1,272.68 mi (2,048.18 km) |
| Oudenburg to Negresti-Oas | 940.81 mi (1,514.08 km) |
| Oudenburg to Nehoiu | 1,139.09 mi (1,833.18 km) |
| Oudenburg to Ocna Mures | 1,001.61 mi (1,611.93 km) |
| Oudenburg to Odobesti | 1,157.97 mi (1,863.57 km) |
| Oudenburg to Odorheiu Secuiesc | 1,065.38 mi (1,714.57 km) |
| Oudenburg to Oltenita | 1,197.90 mi (1,927.83 km) |
| Oudenburg to Onesti | 1,129.87 mi (1,818.35 km) |
| Oudenburg to Oradea | 898.41 mi (1,445.85 km) |
| Oudenburg to Orastie | 991.23 mi (1,595.23 km) |
| Oudenburg to Oravita | 957.16 mi (1,540.40 km) |
| Oudenburg to Orsova | 998.20 mi (1,606.44 km) |
| Oudenburg to Otelu Rosu | 967.24 mi (1,556.63 km) |
| Oudenburg to Otopeni | 1,157.17 mi (1,862.29 km) |
| Oudenburg to Ovidiu | 1,272.24 mi (2,047.47 km) |
