| Delaware to Mangualde | 3,828.65 mi (6,161.61 km) |
| Delaware to Marco de Canavezes | 3,792.82 mi (6,103.96 km) |
| Delaware to Marinha Grande | 3,799.38 mi (6,114.52 km) |
| Delaware to Massama | 3,813.79 mi (6,137.71 km) |
| Delaware to Matosinhos | 3,767.05 mi (6,062.48 km) |
| Delaware to Mealhada | 3,802.93 mi (6,120.23 km) |
| Delaware to Melgaco | 3,759.65 mi (6,050.57 km) |
| Delaware to Melres | 3,784.61 mi (6,090.74 km) |
| Delaware to Mira | 3,788.03 mi (6,096.24 km) |
| Delaware to Miranda do Corvo | 3,817.12 mi (6,143.06 km) |
| Delaware to Mirandela | 3,828.89 mi (6,162.01 km) |
| Delaware to Mogadouro | 3,855.15 mi (6,204.27 km) |
| Delaware to Moimenta da Beira | 3,824.10 mi (6,154.29 km) |
| Delaware to Moita | 3,831.15 mi (6,165.64 km) |
| Delaware to Moncao | 3,751.02 mi (6,036.68 km) |
