| Rhondda to Mangualde | 788.40 mi (1,268.81 km) |
| Rhondda to Marco de Canavezes | 754.86 mi (1,214.83 km) |
| Rhondda to Marinha Grande | 861.38 mi (1,386.25 km) |
| Rhondda to Massama | 932.38 mi (1,500.52 km) |
| Rhondda to Matosinhos | 762.99 mi (1,227.92 km) |
| Rhondda to Mealhada | 812.32 mi (1,307.30 km) |
| Rhondda to Melgaco | 694.76 mi (1,118.11 km) |
| Rhondda to Melres | 766.19 mi (1,233.06 km) |
| Rhondda to Mira | 813.09 mi (1,308.54 km) |
| Rhondda to Miranda do Corvo | 829.60 mi (1,335.11 km) |
| Rhondda to Mirandela | 722.19 mi (1,162.26 km) |
| Rhondda to Mogadouro | 727.40 mi (1,170.63 km) |
| Rhondda to Moimenta da Beira | 761.37 mi (1,225.31 km) |
| Rhondda to Moita | 935.34 mi (1,505.28 km) |
| Rhondda to Moncao | 700.96 mi (1,128.09 km) |
