| Oosterend to Navodari | 1,183.64 mi (1,904.89 km) |
| Oosterend to Negresti-Oas | 839.40 mi (1,350.88 km) |
| Oosterend to Nehoiu | 1,050.62 mi (1,690.81 km) |
| Oosterend to Ocna Mures | 913.57 mi (1,470.25 km) |
| Oosterend to Odobesti | 1,063.20 mi (1,711.06 km) |
| Oosterend to Odorheiu Secuiesc | 972.33 mi (1,564.82 km) |
| Oosterend to Oltenita | 1,118.44 mi (1,799.95 km) |
| Oosterend to Onesti | 1,032.01 mi (1,660.86 km) |
| Oosterend to Oradea | 811.67 mi (1,306.25 km) |
| Oosterend to Orastie | 911.42 mi (1,466.79 km) |
| Oosterend to Oravita | 893.18 mi (1,437.43 km) |
| Oosterend to Orsova | 933.39 mi (1,502.14 km) |
| Oosterend to Otelu Rosu | 894.88 mi (1,440.17 km) |
| Oosterend to Otopeni | 1,076.36 mi (1,732.24 km) |
| Oosterend to Ovidiu | 1,183.78 mi (1,905.11 km) |
