| Chicago Heights to Mangualde | 4,000.96 mi (6,438.93 km) |
| Chicago Heights to Marco de Canavezes | 3,963.67 mi (6,378.92 km) |
| Chicago Heights to Marinha Grande | 3,976.19 mi (6,399.06 km) |
| Chicago Heights to Massama | 3,994.35 mi (6,428.28 km) |
| Chicago Heights to Matosinhos | 3,938.64 mi (6,338.63 km) |
| Chicago Heights to Mealhada | 3,976.94 mi (6,400.27 km) |
| Chicago Heights to Melgaco | 3,927.37 mi (6,320.49 km) |
| Chicago Heights to Melres | 3,956.20 mi (6,366.90 km) |
| Chicago Heights to Mira | 3,962.25 mi (6,376.63 km) |
| Chicago Heights to Miranda do Corvo | 3,991.93 mi (6,424.39 km) |
| Chicago Heights to Mirandela | 3,997.37 mi (6,433.15 km) |
| Chicago Heights to Mogadouro | 4,023.52 mi (6,475.23 km) |
| Chicago Heights to Moimenta da Beira | 3,994.92 mi (6,429.21 km) |
| Chicago Heights to Moita | 4,011.65 mi (6,456.12 km) |
| Chicago Heights to Moncao | 3,919.18 mi (6,307.31 km) |
