| Saint Helens to Mangualde | 917.82 mi (1,477.09 km) |
| Saint Helens to Marco de Canavezes | 883.84 mi (1,422.41 km) |
| Saint Helens to Marinha Grande | 990.12 mi (1,593.44 km) |
| Saint Helens to Massama | 1,061.13 mi (1,707.73 km) |
| Saint Helens to Matosinhos | 891.42 mi (1,434.60 km) |
| Saint Helens to Mealhada | 941.29 mi (1,514.86 km) |
| Saint Helens to Melgaco | 823.26 mi (1,324.90 km) |
| Saint Helens to Melres | 894.98 mi (1,440.33 km) |
| Saint Helens to Mira | 941.79 mi (1,515.66 km) |
| Saint Helens to Miranda do Corvo | 958.75 mi (1,542.95 km) |
| Saint Helens to Mirandela | 851.78 mi (1,370.80 km) |
| Saint Helens to Mogadouro | 857.15 mi (1,379.45 km) |
| Saint Helens to Moimenta da Beira | 890.81 mi (1,433.61 km) |
| Saint Helens to Moita | 1,064.36 mi (1,712.92 km) |
| Saint Helens to Moncao | 829.21 mi (1,334.49 km) |
