| South Portland to Arcos de Valdevez | 3,067.37 mi (4,936.45 km) |
| South Portland to Arcozelo | 3,079.63 mi (4,956.19 km) |
| South Portland to Arganil | 3,132.11 mi (5,040.65 km) |
| South Portland to Arouca | 3,101.84 mi (4,991.93 km) |
| South Portland to Arruda dos Vinhos | 3,121.34 mi (5,023.31 km) |
| South Portland to Aveiro | 3,091.47 mi (4,975.24 km) |
| South Portland to Aver-o-Mar | 3,063.48 mi (4,930.20 km) |
| South Portland to Aves | 3,084.56 mi (4,964.11 km) |
| South Portland to Azambuja | 3,128.37 mi (5,034.62 km) |
| South Portland to Baiao | 3,105.03 mi (4,997.07 km) |
| South Portland to Barcelos | 3,067.44 mi (4,936.57 km) |
| South Portland to Barreiro | 3,131.17 mi (5,039.13 km) |
| South Portland to Batalha | 3,113.71 mi (5,011.03 km) |
| South Portland to Beja | 3,208.22 mi (5,163.13 km) |
| South Portland to Belas | 3,117.93 mi (5,017.82 km) |
