| Ottendorf-Okrilla to Navodari | 832.10 mi (1,339.13 km) |
| Ottendorf-Okrilla to Negresti-Oas | 486.92 mi (783.62 km) |
| Ottendorf-Okrilla to Nehoiu | 699.56 mi (1,125.83 km) |
| Ottendorf-Okrilla to Ocna Mures | 563.26 mi (906.47 km) |
| Ottendorf-Okrilla to Odobesti | 710.96 mi (1,144.19 km) |
| Ottendorf-Okrilla to Odorheiu Secuiesc | 620.50 mi (998.60 km) |
| Ottendorf-Okrilla to Oltenita | 770.07 mi (1,239.31 km) |
| Ottendorf-Okrilla to Onesti | 679.57 mi (1,093.66 km) |
| Ottendorf-Okrilla to Oradea | 462.68 mi (744.61 km) |
| Ottendorf-Okrilla to Orastie | 564.61 mi (908.65 km) |
| Ottendorf-Okrilla to Oravita | 557.37 mi (897.00 km) |
| Ottendorf-Okrilla to Orsova | 595.97 mi (959.12 km) |
| Ottendorf-Okrilla to Otelu Rosu | 552.73 mi (889.54 km) |
| Ottendorf-Okrilla to Otopeni | 727.71 mi (1,171.13 km) |
| Ottendorf-Okrilla to Ovidiu | 832.35 mi (1,339.54 km) |
