| Llantrisant to Mangualde | 784.06 mi (1,261.82 km) |
| Llantrisant to Marco de Canavezes | 750.64 mi (1,208.04 km) |
| Llantrisant to Marinha Grande | 857.21 mi (1,379.55 km) |
| Llantrisant to Massama | 928.21 mi (1,493.81 km) |
| Llantrisant to Matosinhos | 758.90 mi (1,221.34 km) |
| Llantrisant to Mealhada | 808.10 mi (1,300.51 km) |
| Llantrisant to Melgaco | 690.66 mi (1,111.52 km) |
| Llantrisant to Melres | 762.02 mi (1,226.35 km) |
| Llantrisant to Mira | 808.94 mi (1,301.86 km) |
| Llantrisant to Miranda do Corvo | 825.34 mi (1,328.25 km) |
| Llantrisant to Mirandela | 717.78 mi (1,155.16 km) |
| Llantrisant to Mogadouro | 722.87 mi (1,163.35 km) |
| Llantrisant to Moimenta da Beira | 757.02 mi (1,218.30 km) |
| Llantrisant to Moita | 931.11 mi (1,498.47 km) |
| Llantrisant to Moncao | 696.91 mi (1,121.57 km) |
