| Cities | Distance |
|---|---|
| Piraeus to Navodari | 510.64 mi (821.80 km) |
| Piraeus to Negresti-Oas | 685.94 mi (1,103.91 km) |
| Piraeus to Nehoiu | 529.98 mi (852.92 km) |
| Piraeus to Ocna Mures | 583.73 mi (939.43 km) |
| Piraeus to Odobesti | 568.35 mi (914.66 km) |
| Piraeus to Odorheiu Secuiesc | 584.52 mi (940.69 km) |
| Piraeus to Oltenita | 452.11 mi (727.61 km) |
| Piraeus to Onesti | 596.30 mi (959.65 km) |
| Piraeus to Oradea | 636.82 mi (1,024.86 km) |
| Piraeus to Orastie | 546.80 mi (879.99 km) |
| Piraeus to Oravita | 500.73 mi (805.85 km) |
| Piraeus to Orsova | 473.07 mi (761.33 km) |
| Piraeus to Otelu Rosu | 527.64 mi (849.15 km) |
| Piraeus to Otopeni | 473.47 mi (761.98 km) |
| Piraeus to Ovidiu | 506.25 mi (814.73 km) |