| Syston to Mangualde | 892.84 mi (1,436.89 km) |
| Syston to Marco de Canavezes | 861.78 mi (1,386.91 km) |
| Syston to Marinha Grande | 968.93 mi (1,559.34 km) |
| Syston to Massama | 1,039.70 mi (1,673.23 km) |
| Syston to Matosinhos | 871.98 mi (1,403.32 km) |
| Syston to Mealhada | 919.09 mi (1,479.14 km) |
| Syston to Melgaco | 803.80 mi (1,293.59 km) |
| Syston to Melres | 873.87 mi (1,406.37 km) |
| Syston to Mira | 920.98 mi (1,482.17 km) |
| Syston to Miranda do Corvo | 935.51 mi (1,505.56 km) |
| Syston to Mirandela | 825.57 mi (1,328.63 km) |
| Syston to Mogadouro | 828.39 mi (1,333.17 km) |
| Syston to Moimenta da Beira | 865.79 mi (1,393.36 km) |
| Syston to Moita | 1,041.54 mi (1,676.20 km) |
| Syston to Moncao | 810.73 mi (1,304.74 km) |
