| Wealdstone to Mangualde | 837.60 mi (1,347.99 km) |
| Wealdstone to Marco de Canavezes | 809.02 mi (1,302.00 km) |
| Wealdstone to Marinha Grande | 916.23 mi (1,474.53 km) |
| Wealdstone to Massama | 986.45 mi (1,587.54 km) |
| Wealdstone to Matosinhos | 821.25 mi (1,321.68 km) |
| Wealdstone to Mealhada | 865.87 mi (1,393.49 km) |
| Wealdstone to Melgaco | 753.55 mi (1,212.73 km) |
| Wealdstone to Melres | 821.80 mi (1,322.55 km) |
| Wealdstone to Mira | 868.84 mi (1,398.26 km) |
| Wealdstone to Miranda do Corvo | 881.38 mi (1,418.45 km) |
| Wealdstone to Mirandela | 769.80 mi (1,238.88 km) |
| Wealdstone to Mogadouro | 770.64 mi (1,240.23 km) |
| Wealdstone to Moimenta da Beira | 810.69 mi (1,304.67 km) |
| Wealdstone to Moita | 987.21 mi (1,588.77 km) |
| Wealdstone to Moncao | 761.22 mi (1,225.06 km) |
