| Olton to Montalegre | 784.85 mi (1,263.09 km) |
| Olton to Montemor-o-Novo | 1,000.89 mi (1,610.78 km) |
| Olton to Montemor-o-Velho | 908.17 mi (1,461.56 km) |
| Olton to Montijo | 1,009.21 mi (1,624.17 km) |
| Olton to Mortagua | 883.22 mi (1,421.41 km) |
| Olton to Moura | 1,024.92 mi (1,649.46 km) |
| Olton to Murtosa | 870.31 mi (1,400.63 km) |
| Olton to Nazare | 951.79 mi (1,531.75 km) |
| Olton to Nelas | 871.66 mi (1,402.80 km) |
| Olton to Obidos | 969.17 mi (1,559.74 km) |
| Olton to Odemira | 1,077.97 mi (1,734.83 km) |
| Olton to Odivelas | 1,006.76 mi (1,620.23 km) |
| Olton to Oeiras | 1,016.09 mi (1,635.24 km) |
| Olton to Olhao | 1,104.32 mi (1,777.22 km) |
| Olton to Oliveira de Azemeis | 860.62 mi (1,385.03 km) |
