| South Portland to Benavente | 3,134.66 mi (5,044.75 km) |
| South Portland to Bombarral | 3,108.33 mi (5,002.38 km) |
| South Portland to Bougado | 3,075.31 mi (4,949.23 km) |
| South Portland to Braga | 3,075.74 mi (4,949.93 km) |
| South Portland to Braganca | 3,146.30 mi (5,063.48 km) |
| South Portland to Cabeceiras de Basto | 3,095.21 mi (4,981.26 km) |
| South Portland to Cacem | 3,116.32 mi (5,015.24 km) |
| South Portland to Cadaval | 3,112.05 mi (5,008.36 km) |
| South Portland to Caldas da Rainha | 3,105.02 mi (4,997.05 km) |
| South Portland to Calheta | 2,929.69 mi (4,714.88 km) |
| South Portland to Camara de Lobos | 2,940.14 mi (4,731.69 km) |
| South Portland to Canico | 2,948.43 mi (4,745.04 km) |
| South Portland to Cantanhede | 3,102.62 mi (4,993.18 km) |
| South Portland to Carregal do Sal | 3,128.23 mi (5,034.40 km) |
| South Portland to Cartaxo | 3,129.80 mi (5,036.92 km) |
