| Constanta to Mangualde | 1,858.21 mi (2,990.49 km) |
| Constanta to Marco de Canavezes | 1,864.16 mi (3,000.07 km) |
| Constanta to Marinha Grande | 1,936.92 mi (3,117.17 km) |
| Constanta to Massama | 1,979.92 mi (3,186.37 km) |
| Constanta to Matosinhos | 1,891.23 mi (3,043.64 km) |
| Constanta to Mealhada | 1,897.44 mi (3,053.64 km) |
| Constanta to Melgaco | 1,850.05 mi (2,977.36 km) |
| Constanta to Melres | 1,879.08 mi (3,024.09 km) |
| Constanta to Mira | 1,910.23 mi (3,074.21 km) |
| Constanta to Miranda do Corvo | 1,898.55 mi (3,055.42 km) |
| Constanta to Mirandela | 1,809.91 mi (2,912.76 km) |
| Constanta to Mogadouro | 1,790.28 mi (2,881.17 km) |
| Constanta to Moimenta da Beira | 1,842.30 mi (2,964.89 km) |
| Constanta to Moita | 1,968.40 mi (3,167.83 km) |
| Constanta to Moncao | 1,861.38 mi (2,995.60 km) |
