| Alton to Montalegre | 720.62 mi (1,159.73 km) |
| Alton to Montemor-o-Novo | 932.40 mi (1,500.56 km) |
| Alton to Montemor-o-Velho | 844.10 mi (1,358.44 km) |
| Alton to Montijo | 943.25 mi (1,518.01 km) |
| Alton to Mortagua | 817.86 mi (1,316.21 km) |
| Alton to Moura | 953.07 mi (1,533.81 km) |
| Alton to Murtosa | 807.24 mi (1,299.13 km) |
| Alton to Nazare | 888.10 mi (1,429.27 km) |
| Alton to Nelas | 804.89 mi (1,295.34 km) |
| Alton to Obidos | 905.38 mi (1,457.06 km) |
| Alton to Odemira | 1,009.43 mi (1,624.52 km) |
| Alton to Odivelas | 942.01 mi (1,516.02 km) |
| Alton to Oeiras | 951.66 mi (1,531.55 km) |
| Alton to Olhao | 1,032.49 mi (1,661.63 km) |
| Alton to Oliveira de Azemeis | 797.11 mi (1,282.83 km) |
