| Olton to Santarem | 969.47 mi (1,560.21 km) |
| Olton to Santiago do Cacem | 1,050.18 mi (1,690.10 km) |
| Olton to Santo Andre | 1,048.73 mi (1,687.77 km) |
| Olton to Santo Tirso | 828.35 mi (1,333.10 km) |
| Olton to Sao Bras de Alportel | 1,096.53 mi (1,764.70 km) |
| Olton to Sao Felix da Marinha | 850.56 mi (1,368.84 km) |
| Olton to Sao Joao da Madeira | 857.12 mi (1,379.41 km) |
| Olton to Sao Joao de Ver | 854.50 mi (1,375.18 km) |
| Olton to Sao Mamede de Infesta | 839.37 mi (1,350.84 km) |
| Olton to Sao Pedro do Sul | 859.71 mi (1,383.57 km) |
| Olton to Satao | 855.56 mi (1,376.88 km) |
| Olton to Seia | 875.67 mi (1,409.26 km) |
| Olton to Senhora da Hora | 841.19 mi (1,353.76 km) |
| Olton to Serpa | 1,039.50 mi (1,672.91 km) |
| Olton to Serta | 922.88 mi (1,485.22 km) |
