| Chicago to Montalegre | 3,949.80 mi (6,356.58 km) |
| Chicago to Montemor-o-Novo | 4,039.95 mi (6,501.67 km) |
| Chicago to Montemor-o-Velho | 3,965.63 mi (6,382.07 km) |
| Chicago to Montijo | 4,007.06 mi (6,448.73 km) |
| Chicago to Mortagua | 3,977.07 mi (6,400.47 km) |
| Chicago to Moura | 4,093.93 mi (6,588.55 km) |
| Chicago to Murtosa | 3,948.58 mi (6,354.62 km) |
| Chicago to Nazare | 3,967.48 mi (6,385.04 km) |
| Chicago to Nelas | 3,991.68 mi (6,423.98 km) |
| Chicago to Obidos | 3,971.62 mi (6,391.70 km) |
| Chicago to Odemira | 4,058.44 mi (6,531.43 km) |
| Chicago to Odivelas | 3,990.31 mi (6,421.79 km) |
| Chicago to Oeiras | 3,987.67 mi (6,417.54 km) |
| Chicago to Olhao | 4,115.68 mi (6,623.55 km) |
| Chicago to Oliveira de Azemeis | 3,952.16 mi (6,360.39 km) |
