| Sidcup to Mangualde | 836.40 mi (1,346.06 km) |
| Sidcup to Marco de Canavezes | 808.77 mi (1,301.59 km) |
| Sidcup to Marinha Grande | 915.86 mi (1,473.93 km) |
| Sidcup to Massama | 985.82 mi (1,586.52 km) |
| Sidcup to Matosinhos | 821.70 mi (1,322.40 km) |
| Sidcup to Mealhada | 865.38 mi (1,392.69 km) |
| Sidcup to Melgaco | 754.28 mi (1,213.89 km) |
| Sidcup to Melres | 821.77 mi (1,322.51 km) |
| Sidcup to Mira | 868.73 mi (1,398.09 km) |
| Sidcup to Miranda do Corvo | 880.54 mi (1,417.09 km) |
| Sidcup to Mirandela | 768.50 mi (1,236.78 km) |
| Sidcup to Mogadouro | 768.58 mi (1,236.91 km) |
| Sidcup to Moimenta da Beira | 809.57 mi (1,302.88 km) |
| Sidcup to Moita | 986.18 mi (1,587.11 km) |
| Sidcup to Moncao | 762.18 mi (1,226.61 km) |
