| Conwy to Mangualde | 894.88 mi (1,440.17 km) |
| Conwy to Marco de Canavezes | 859.62 mi (1,383.42 km) |
| Conwy to Marinha Grande | 965.18 mi (1,553.31 km) |
| Conwy to Massama | 1,036.14 mi (1,667.51 km) |
| Conwy to Matosinhos | 865.95 mi (1,393.62 km) |
| Conwy to Mealhada | 916.95 mi (1,475.69 km) |
| Conwy to Melgaco | 798.03 mi (1,284.30 km) |
| Conwy to Melres | 870.27 mi (1,400.56 km) |
| Conwy to Mira | 916.80 mi (1,475.45 km) |
| Conwy to Miranda do Corvo | 934.85 mi (1,504.49 km) |
| Conwy to Mirandela | 829.64 mi (1,335.18 km) |
| Conwy to Mogadouro | 836.26 mi (1,345.83 km) |
| Conwy to Moimenta da Beira | 867.96 mi (1,396.85 km) |
| Conwy to Moita | 1,040.01 mi (1,673.73 km) |
| Conwy to Moncao | 803.52 mi (1,293.14 km) |
