| Kallithea to Navodari | 508.83 mi (818.88 km) |
| Kallithea to Negresti-Oas | 685.50 mi (1,103.21 km) |
| Kallithea to Nehoiu | 528.81 mi (851.03 km) |
| Kallithea to Ocna Mures | 583.20 mi (938.58 km) |
| Kallithea to Odobesti | 567.05 mi (912.57 km) |
| Kallithea to Odorheiu Secuiesc | 583.65 mi (939.30 km) |
| Kallithea to Oltenita | 450.71 mi (725.35 km) |
| Kallithea to Onesti | 595.11 mi (957.74 km) |
| Kallithea to Oradea | 636.71 mi (1,024.69 km) |
| Kallithea to Orastie | 546.44 mi (879.41 km) |
| Kallithea to Oravita | 500.82 mi (805.99 km) |
| Kallithea to Orsova | 472.97 mi (761.17 km) |
| Kallithea to Otelu Rosu | 527.51 mi (848.95 km) |
| Kallithea to Otopeni | 472.28 mi (760.07 km) |
| Kallithea to Ovidiu | 504.44 mi (811.82 km) |
