| Caister-on-Sea to Montalegre | 869.73 mi (1,399.69 km) |
| Caister-on-Sea to Montemor-o-Novo | 1,077.81 mi (1,734.57 km) |
| Caister-on-Sea to Montemor-o-Velho | 992.84 mi (1,597.82 km) |
| Caister-on-Sea to Montijo | 1,090.48 mi (1,754.95 km) |
| Caister-on-Sea to Mortagua | 965.89 mi (1,554.45 km) |
| Caister-on-Sea to Moura | 1,095.50 mi (1,763.04 km) |
| Caister-on-Sea to Murtosa | 956.68 mi (1,539.63 km) |
| Caister-on-Sea to Nazare | 1,036.95 mi (1,668.80 km) |
| Caister-on-Sea to Nelas | 952.03 mi (1,532.15 km) |
| Caister-on-Sea to Obidos | 1,054.10 mi (1,696.41 km) |
| Caister-on-Sea to Odemira | 1,154.55 mi (1,858.07 km) |
| Caister-on-Sea to Odivelas | 1,090.04 mi (1,754.25 km) |
| Caister-on-Sea to Oeiras | 1,099.87 mi (1,770.06 km) |
| Caister-on-Sea to Olhao | 1,174.66 mi (1,890.44 km) |
| Caister-on-Sea to Oliveira de Azemeis | 946.35 mi (1,523.00 km) |
