| Belfast to Mangualde | 970.44 mi (1,561.77 km) |
| Belfast to Marco de Canavezes | 932.32 mi (1,500.43 km) |
| Belfast to Marinha Grande | 1,035.20 mi (1,665.99 km) |
| Belfast to Massama | 1,105.52 mi (1,779.16 km) |
| Belfast to Matosinhos | 935.41 mi (1,505.40 km) |
| Belfast to Mealhada | 988.89 mi (1,591.46 km) |
| Belfast to Melgaco | 868.79 mi (1,398.18 km) |
| Belfast to Melres | 941.65 mi (1,515.45 km) |
| Belfast to Mira | 987.08 mi (1,588.55 km) |
| Belfast to Miranda do Corvo | 1,007.75 mi (1,621.82 km) |
| Belfast to Mirandela | 907.69 mi (1,460.79 km) |
| Belfast to Mogadouro | 917.10 mi (1,475.93 km) |
| Belfast to Moimenta da Beira | 943.99 mi (1,519.21 km) |
| Belfast to Moita | 1,111.01 mi (1,787.99 km) |
| Belfast to Moncao | 873.00 mi (1,404.96 km) |
