| Calne to Mangualde | 797.24 mi (1,283.03 km) |
| Calne to Marco de Canavezes | 766.16 mi (1,233.01 km) |
| Calne to Marinha Grande | 873.31 mi (1,405.46 km) |
| Calne to Massama | 944.07 mi (1,519.33 km) |
| Calne to Matosinhos | 776.45 mi (1,249.58 km) |
| Calne to Mealhada | 823.46 mi (1,325.24 km) |
| Calne to Melgaco | 708.29 mi (1,139.88 km) |
| Calne to Melres | 778.27 mi (1,252.51 km) |
| Calne to Mira | 825.38 mi (1,328.32 km) |
| Calne to Miranda do Corvo | 839.88 mi (1,351.65 km) |
| Calne to Mirandela | 730.00 mi (1,174.83 km) |
| Calne to Mogadouro | 733.00 mi (1,179.65 km) |
| Calne to Moimenta da Beira | 770.18 mi (1,239.49 km) |
| Calne to Moita | 945.90 mi (1,522.29 km) |
| Calne to Moncao | 715.28 mi (1,151.14 km) |
