| South Portland to Santarem | 3,131.87 mi (5,040.26 km) |
| South Portland to Santiago do Cacem | 3,169.36 mi (5,100.59 km) |
| South Portland to Santo Andre | 3,165.88 mi (5,095.00 km) |
| South Portland to Santo Tirso | 3,079.77 mi (4,956.41 km) |
| South Portland to Sao Bras de Alportel | 3,236.95 mi (5,209.36 km) |
| South Portland to Sao Felix da Marinha | 3,081.04 mi (4,958.45 km) |
| South Portland to Sao Joao da Madeira | 3,091.37 mi (4,975.07 km) |
| South Portland to Sao Joao de Ver | 3,086.77 mi (4,967.68 km) |
| South Portland to Sao Mamede de Infesta | 3,077.32 mi (4,952.47 km) |
| South Portland to Sao Pedro do Sul | 3,115.67 mi (5,014.19 km) |
| South Portland to Satao | 3,131.94 mi (5,040.37 km) |
| South Portland to Seia | 3,142.68 mi (5,057.65 km) |
| South Portland to Senhora da Hora | 3,075.31 mi (4,949.24 km) |
| South Portland to Serpa | 3,224.77 mi (5,189.77 km) |
| South Portland to Serta | 3,142.56 mi (5,057.46 km) |
