| Rietavas to Montemor-o-Novo | 1,817.48 mi (2,924.96 km) |
| Rietavas to Montemor-o-Velho | 1,754.46 mi (2,823.53 km) |
| Rietavas to Montijo | 1,839.36 mi (2,960.17 km) |
| Rietavas to Mortagua | 1,724.90 mi (2,775.96 km) |
| Rietavas to Moura | 1,818.99 mi (2,927.38 km) |
| Rietavas to Murtosa | 1,723.77 mi (2,774.14 km) |
| Rietavas to Nazare | 1,797.22 mi (2,892.34 km) |
| Rietavas to Nelas | 1,707.13 mi (2,747.35 km) |
| Rietavas to Obidos | 1,812.98 mi (2,917.72 km) |
| Rietavas to Odemira | 1,888.95 mi (3,039.97 km) |
| Rietavas to Odivelas | 1,843.46 mi (2,966.76 km) |
| Rietavas to Oeiras | 1,853.88 mi (2,983.53 km) |
| Rietavas to Olhao | 1,892.46 mi (3,045.63 km) |
| Rietavas to Oliveira de Azemeis | 1,712.74 mi (2,756.38 km) |
| Rietavas to Oliveira de Frades | 1,708.65 mi (2,749.81 km) |
