| Piraeus to Novi di Modena | 814.97 mi (1,311.57 km) |
| Piraeus to Novi Ligure | 901.19 mi (1,450.33 km) |
| Piraeus to Nuoro | 783.56 mi (1,261.02 km) |
| Piraeus to Occhiobello | 787.97 mi (1,268.12 km) |
| Piraeus to Oderzo | 787.71 mi (1,267.69 km) |
| Piraeus to Oggiono | 911.33 mi (1,466.65 km) |
| Piraeus to Olbia | 781.45 mi (1,257.62 km) |
| Piraeus to Oleggio | 934.82 mi (1,504.44 km) |
| Piraeus to Olgiate Comasco | 927.17 mi (1,492.13 km) |
| Piraeus to Olgiate Olona | 925.43 mi (1,489.34 km) |
| Piraeus to Omegna | 953.77 mi (1,534.94 km) |
| Piraeus to Opera | 902.85 mi (1,453.00 km) |
| Piraeus to Oppeano | 818.64 mi (1,317.47 km) |
| Piraeus to Orbassano | 963.74 mi (1,550.99 km) |
| Piraeus to Orbetello | 725.14 mi (1,167.00 km) |
