| Altenburg to Marco de Canavezes | 1,190.02 mi (1,915.16 km) |
| Altenburg to Marinha Grande | 1,287.60 mi (2,072.19 km) |
| Altenburg to Massama | 1,349.04 mi (2,171.06 km) |
| Altenburg to Matosinhos | 1,211.49 mi (1,949.70 km) |
| Altenburg to Mealhada | 1,238.90 mi (1,993.81 km) |
| Altenburg to Melgaco | 1,152.79 mi (1,855.24 km) |
| Altenburg to Melres | 1,205.10 mi (1,939.42 km) |
| Altenburg to Mira | 1,247.44 mi (2,007.56 km) |
| Altenburg to Miranda do Corvo | 1,247.93 mi (2,008.35 km) |
| Altenburg to Mirandela | 1,138.64 mi (1,832.47 km) |
| Altenburg to Mogadouro | 1,127.88 mi (1,815.15 km) |
| Altenburg to Moimenta da Beira | 1,178.74 mi (1,897.00 km) |
| Altenburg to Moita | 1,343.45 mi (2,162.07 km) |
| Altenburg to Moncao | 1,163.17 mi (1,871.94 km) |
| Altenburg to Montalegre | 1,147.02 mi (1,845.96 km) |
