| Opfikon to Mangualde | 935.77 mi (1,505.97 km) |
| Opfikon to Marco de Canavezes | 929.85 mi (1,496.45 km) |
| Opfikon to Marinha Grande | 1,020.60 mi (1,642.49 km) |
| Opfikon to Massama | 1,077.49 mi (1,734.06 km) |
| Opfikon to Matosinhos | 953.84 mi (1,535.06 km) |
| Opfikon to Mealhada | 974.07 mi (1,567.62 km) |
| Opfikon to Melgaco | 901.25 mi (1,450.42 km) |
| Opfikon to Melres | 945.15 mi (1,521.07 km) |
| Opfikon to Mira | 984.22 mi (1,583.95 km) |
| Opfikon to Miranda do Corvo | 980.65 mi (1,578.21 km) |
| Opfikon to Mirandela | 876.40 mi (1,410.43 km) |
| Opfikon to Mogadouro | 862.23 mi (1,387.63 km) |
| Opfikon to Moimenta da Beira | 914.52 mi (1,471.78 km) |
| Opfikon to Moita | 1,070.16 mi (1,722.26 km) |
| Opfikon to Moncao | 912.23 mi (1,468.09 km) |
