| Sligo to Marco de Canavezes | 904.11 mi (1,455.02 km) |
| Sligo to Marinha Grande | 1,003.23 mi (1,614.54 km) |
| Sligo to Massama | 1,072.27 mi (1,725.66 km) |
| Sligo to Matosinhos | 904.03 mi (1,454.90 km) |
| Sligo to Mealhada | 959.25 mi (1,543.77 km) |
| Sligo to Melgaco | 839.54 mi (1,351.11 km) |
| Sligo to Melres | 912.04 mi (1,467.79 km) |
| Sligo to Mira | 955.87 mi (1,538.32 km) |
| Sligo to Miranda do Corvo | 978.85 mi (1,575.31 km) |
| Sligo to Mirandela | 885.13 mi (1,424.47 km) |
| Sligo to Mogadouro | 897.29 mi (1,444.05 km) |
| Sligo to Moimenta da Beira | 918.92 mi (1,478.85 km) |
| Sligo to Moita | 1,079.26 mi (1,736.91 km) |
| Sligo to Moncao | 842.48 mi (1,355.84 km) |
| Sligo to Montalegre | 860.35 mi (1,384.60 km) |
