| Waltham Cross to Mangualde | 849.23 mi (1,366.71 km) |
| Waltham Cross to Marco de Canavezes | 821.00 mi (1,321.27 km) |
| Waltham Cross to Marinha Grande | 928.17 mi (1,493.74 km) |
| Waltham Cross to Massama | 998.30 mi (1,606.61 km) |
| Waltham Cross to Matosinhos | 833.47 mi (1,341.35 km) |
| Waltham Cross to Mealhada | 877.77 mi (1,412.63 km) |
| Waltham Cross to Melgaco | 765.86 mi (1,232.53 km) |
| Waltham Cross to Melres | 833.85 mi (1,341.96 km) |
| Waltham Cross to Mira | 880.87 mi (1,417.63 km) |
| Waltham Cross to Miranda do Corvo | 893.15 mi (1,437.39 km) |
| Waltham Cross to Mirandela | 781.39 mi (1,257.52 km) |
| Waltham Cross to Mogadouro | 781.93 mi (1,258.39 km) |
| Waltham Cross to Moimenta da Beira | 822.35 mi (1,323.44 km) |
| Waltham Cross to Moita | 998.92 mi (1,607.60 km) |
| Waltham Cross to Moncao | 773.60 mi (1,244.99 km) |
