| Spalding to Mangualde | 914.41 mi (1,471.60 km) |
| Spalding to Marco de Canavezes | 884.56 mi (1,423.57 km) |
| Spalding to Marinha Grande | 991.81 mi (1,596.16 km) |
| Spalding to Massama | 1,062.35 mi (1,709.68 km) |
| Spalding to Matosinhos | 895.72 mi (1,441.53 km) |
| Spalding to Mealhada | 941.69 mi (1,515.50 km) |
| Spalding to Melgaco | 827.70 mi (1,332.06 km) |
| Spalding to Melres | 896.99 mi (1,443.56 km) |
| Spalding to Mira | 944.09 mi (1,519.37 km) |
| Spalding to Miranda do Corvo | 957.67 mi (1,541.22 km) |
| Spalding to Mirandela | 846.82 mi (1,362.83 km) |
| Spalding to Mogadouro | 848.60 mi (1,365.68 km) |
| Spalding to Moimenta da Beira | 887.41 mi (1,428.15 km) |
| Spalding to Moita | 1,063.65 mi (1,711.79 km) |
| Spalding to Moncao | 834.97 mi (1,343.75 km) |
