| Oraiokastro to Navodari | 381.39 mi (613.79 km) |
| Oraiokastro to Negresti-Oas | 493.69 mi (794.52 km) |
| Oraiokastro to Nehoiu | 362.08 mi (582.71 km) |
| Oraiokastro to Ocna Mures | 393.67 mi (633.56 km) |
| Oraiokastro to Odobesti | 405.53 mi (652.64 km) |
| Oraiokastro to Odorheiu Secuiesc | 403.62 mi (649.56 km) |
| Oraiokastro to Oltenita | 299.43 mi (481.88 km) |
| Oraiokastro to Onesti | 427.68 mi (688.29 km) |
| Oraiokastro to Oradea | 440.76 mi (709.34 km) |
| Oraiokastro to Orastie | 353.82 mi (569.41 km) |
| Oraiokastro to Oravita | 304.03 mi (489.29 km) |
| Oraiokastro to Orsova | 277.08 mi (445.92 km) |
| Oraiokastro to Otelu Rosu | 331.85 mi (534.06 km) |
| Oraiokastro to Otopeni | 308.53 mi (496.53 km) |
| Oraiokastro to Ovidiu | 377.13 mi (606.93 km) |
