| Upminster to Montalegre | 771.91 mi (1,242.27 km) |
| Upminster to Montemor-o-Novo | 981.12 mi (1,578.96 km) |
| Upminster to Montemor-o-Velho | 895.14 mi (1,440.59 km) |
| Upminster to Montijo | 993.22 mi (1,598.44 km) |
| Upminster to Mortagua | 868.37 mi (1,397.51 km) |
| Upminster to Moura | 999.85 mi (1,609.11 km) |
| Upminster to Murtosa | 858.80 mi (1,382.11 km) |
| Upminster to Nazare | 939.23 mi (1,511.55 km) |
| Upminster to Nelas | 854.77 mi (1,375.61 km) |
| Upminster to Obidos | 956.42 mi (1,539.21 km) |
| Upminster to Odemira | 1,057.98 mi (1,702.66 km) |
| Upminster to Odivelas | 992.56 mi (1,597.37 km) |
| Upminster to Oeiras | 1,002.34 mi (1,613.10 km) |
| Upminster to Olhao | 1,079.14 mi (1,736.71 km) |
| Upminster to Oliveira de Azemeis | 848.52 mi (1,365.56 km) |
