| Chicago Heights to Montalegre | 3,958.51 mi (6,370.61 km) |
| Chicago Heights to Montemor-o-Novo | 4,047.38 mi (6,513.64 km) |
| Chicago Heights to Montemor-o-Velho | 3,973.56 mi (6,394.83 km) |
| Chicago Heights to Montijo | 4,014.38 mi (6,460.52 km) |
| Chicago Heights to Mortagua | 3,985.18 mi (6,413.53 km) |
| Chicago Heights to Moura | 4,101.31 mi (6,600.42 km) |
| Chicago Heights to Murtosa | 3,956.74 mi (6,367.75 km) |
| Chicago Heights to Nazare | 3,975.13 mi (6,397.35 km) |
| Chicago Heights to Nelas | 3,999.88 mi (6,437.19 km) |
| Chicago Heights to Obidos | 3,979.16 mi (6,403.83 km) |
| Chicago Heights to Odemira | 4,065.40 mi (6,542.63 km) |
| Chicago Heights to Odivelas | 3,997.63 mi (6,433.57 km) |
| Chicago Heights to Oeiras | 3,994.92 mi (6,429.21 km) |
| Chicago Heights to Olhao | 4,122.57 mi (6,634.63 km) |
| Chicago Heights to Oliveira de Azemeis | 3,960.39 mi (6,373.63 km) |
