| Cay to Mangualde | 2,053.00 mi (3,303.98 km) |
| Cay to Marco de Canavezes | 2,067.15 mi (3,326.75 km) |
| Cay to Marinha Grande | 2,124.12 mi (3,418.45 km) |
| Cay to Massama | 2,156.00 mi (3,469.74 km) |
| Cay to Matosinhos | 2,095.45 mi (3,372.30 km) |
| Cay to Mealhada | 2,091.19 mi (3,365.44 km) |
| Cay to Melgaco | 2,064.87 mi (3,323.09 km) |
| Cay to Melres | 2,081.18 mi (3,349.34 km) |
| Cay to Mira | 2,105.30 mi (3,388.15 km) |
| Cay to Miranda do Corvo | 2,088.47 mi (3,361.06 km) |
| Cay to Mirandela | 2,014.59 mi (3,242.17 km) |
| Cay to Mogadouro | 1,991.99 mi (3,205.79 km) |
| Cay to Moimenta da Beira | 2,041.50 mi (3,285.47 km) |
| Cay to Moita | 2,142.28 mi (3,447.66 km) |
| Cay to Moncao | 2,076.08 mi (3,341.13 km) |
