| Portales to Mangualde | 4,994.15 mi (8,037.30 km) |
| Portales to Marco de Canavezes | 4,956.55 mi (7,976.79 km) |
| Portales to Marinha Grande | 4,970.06 mi (7,998.55 km) |
| Portales to Massama | 4,988.39 mi (8,028.04 km) |
| Portales to Matosinhos | 4,931.70 mi (7,936.80 km) |
| Portales to Mealhada | 4,970.45 mi (7,999.17 km) |
| Portales to Melgaco | 4,919.41 mi (7,917.02 km) |
| Portales to Melres | 4,949.25 mi (7,965.05 km) |
| Portales to Mira | 4,955.80 mi (7,975.59 km) |
| Portales to Miranda do Corvo | 4,985.56 mi (8,023.48 km) |
| Portales to Mirandela | 4,989.59 mi (8,029.98 km) |
| Portales to Mogadouro | 5,015.69 mi (8,071.98 km) |
| Portales to Moimenta da Beira | 4,987.78 mi (8,027.05 km) |
| Portales to Moita | 5,005.70 mi (8,055.89 km) |
| Portales to Moncao | 4,911.36 mi (7,904.06 km) |
