| Piraeus to Montemor-o-Novo | 1,719.78 mi (2,767.71 km) |
| Piraeus to Montemor-o-Velho | 1,731.85 mi (2,787.14 km) |
| Piraeus to Montijo | 1,755.89 mi (2,825.83 km) |
| Piraeus to Mortagua | 1,706.61 mi (2,746.52 km) |
| Piraeus to Moura | 1,684.26 mi (2,710.55 km) |
| Piraeus to Murtosa | 1,725.95 mi (2,777.64 km) |
| Piraeus to Nazare | 1,756.23 mi (2,826.38 km) |
| Piraeus to Nelas | 1,686.08 mi (2,713.48 km) |
| Piraeus to Obidos | 1,763.11 mi (2,837.45 km) |
| Piraeus to Odemira | 1,754.46 mi (2,823.53 km) |
| Piraeus to Odivelas | 1,769.69 mi (2,848.04 km) |
| Piraeus to Oeiras | 1,778.10 mi (2,861.58 km) |
| Piraeus to Olhao | 1,719.31 mi (2,766.96 km) |
| Piraeus to Oliveira de Azemeis | 1,717.17 mi (2,763.51 km) |
| Piraeus to Oliveira de Frades | 1,702.52 mi (2,739.95 km) |
