| Altdorf to Mangualde | 923.26 mi (1,485.84 km) |
| Altdorf to Marco de Canavezes | 919.16 mi (1,479.25 km) |
| Altdorf to Marinha Grande | 1,007.60 mi (1,621.58 km) |
| Altdorf to Massama | 1,062.95 mi (1,710.65 km) |
| Altdorf to Matosinhos | 943.76 mi (1,518.84 km) |
| Altdorf to Mealhada | 961.88 mi (1,547.99 km) |
| Altdorf to Melgaco | 893.04 mi (1,437.20 km) |
| Altdorf to Melres | 934.46 mi (1,503.87 km) |
| Altdorf to Mira | 972.46 mi (1,565.03 km) |
| Altdorf to Miranda do Corvo | 967.70 mi (1,557.36 km) |
| Altdorf to Mirandela | 865.33 mi (1,392.62 km) |
| Altdorf to Mogadouro | 850.20 mi (1,368.27 km) |
| Altdorf to Moimenta da Beira | 902.72 mi (1,452.78 km) |
| Altdorf to Moita | 1,055.08 mi (1,697.98 km) |
| Altdorf to Moncao | 904.13 mi (1,455.06 km) |
