| Willoughby to Mangualde | 3,709.26 mi (5,969.47 km) |
| Willoughby to Marco de Canavezes | 3,673.05 mi (5,911.21 km) |
| Willoughby to Marinha Grande | 3,681.19 mi (5,924.30 km) |
| Willoughby to Massama | 3,696.69 mi (5,949.25 km) |
| Willoughby to Matosinhos | 3,647.46 mi (5,870.01 km) |
| Willoughby to Mealhada | 3,683.98 mi (5,928.79 km) |
| Willoughby to Melgaco | 3,639.11 mi (5,856.59 km) |
| Willoughby to Melres | 3,665.02 mi (5,898.29 km) |
| Willoughby to Mira | 3,669.12 mi (5,904.88 km) |
| Willoughby to Miranda do Corvo | 3,698.38 mi (5,951.97 km) |
| Willoughby to Mirandela | 3,708.56 mi (5,968.34 km) |
| Willoughby to Mogadouro | 3,734.80 mi (6,010.57 km) |
| Willoughby to Moimenta da Beira | 3,704.33 mi (5,961.54 km) |
| Willoughby to Moita | 3,714.03 mi (5,977.16 km) |
| Willoughby to Moncao | 3,630.58 mi (5,842.86 km) |
