| Western Springs to Mangualde | 4,003.58 mi (6,443.14 km) |
| Western Springs to Marco de Canavezes | 3,966.11 mi (6,382.84 km) |
| Western Springs to Marinha Grande | 3,979.40 mi (6,404.23 km) |
| Western Springs to Massama | 3,998.06 mi (6,434.25 km) |
| Western Springs to Matosinhos | 3,941.18 mi (6,342.72 km) |
| Western Springs to Mealhada | 3,979.79 mi (6,404.85 km) |
| Western Springs to Melgaco | 3,929.42 mi (6,323.79 km) |
| Western Springs to Melres | 3,958.74 mi (6,370.98 km) |
| Western Springs to Mira | 3,965.13 mi (6,381.26 km) |
| Western Springs to Miranda do Corvo | 3,994.87 mi (6,429.13 km) |
| Western Springs to Mirandela | 3,999.50 mi (6,436.57 km) |
| Western Springs to Mogadouro | 4,025.63 mi (6,478.62 km) |
| Western Springs to Moimenta da Beira | 3,997.35 mi (6,433.11 km) |
| Western Springs to Moita | 4,015.35 mi (6,462.07 km) |
| Western Springs to Moncao | 3,921.29 mi (6,310.70 km) |
