| Cities | Distance |
|---|---|
| Piraeus to Oria | 367.06 mi (590.73 km) |
| Piraeus to Oristano | 819.53 mi (1,318.90 km) |
| Piraeus to Orta Nova | 482.50 mi (776.50 km) |
| Piraeus to Orte | 670.45 mi (1,078.99 km) |
| Piraeus to Ortona | 575.01 mi (925.40 km) |
| Piraeus to Orvieto | 690.58 mi (1,111.38 km) |
| Piraeus to Orzinuovi | 873.47 mi (1,405.71 km) |
| Piraeus to Osimo | 654.85 mi (1,053.88 km) |
| Piraeus to Ospitaletto | 873.35 mi (1,405.53 km) |
| Piraeus to Ostuni | 376.91 mi (606.58 km) |
| Piraeus to Ottaviano | 528.84 mi (851.09 km) |
| Piraeus to Ovada | 903.71 mi (1,454.38 km) |
| Piraeus to Ozieri | 803.30 mi (1,292.79 km) |
| Piraeus to Paceco | 604.14 mi (972.26 km) |
| Piraeus to Pachino | 476.97 mi (767.61 km) |