| Gaithersburg to Santarem | 3,575.43 mi (5,754.09 km) |
| Gaithersburg to Santiago do Cacem | 3,608.45 mi (5,807.23 km) |
| Gaithersburg to Santo Andre | 3,605.02 mi (5,801.72 km) |
| Gaithersburg to Santo Tirso | 3,530.68 mi (5,682.07 km) |
| Gaithersburg to Sao Bras de Alportel | 3,673.97 mi (5,912.69 km) |
| Gaithersburg to Sao Felix da Marinha | 3,530.82 mi (5,682.30 km) |
| Gaithersburg to Sao Joao da Madeira | 3,540.84 mi (5,698.43 km) |
| Gaithersburg to Sao Joao de Ver | 3,536.36 mi (5,691.23 km) |
| Gaithersburg to Sao Mamede de Infesta | 3,527.66 mi (5,677.22 km) |
| Gaithersburg to Sao Pedro do Sul | 3,565.12 mi (5,737.51 km) |
| Gaithersburg to Satao | 3,581.70 mi (5,764.18 km) |
| Gaithersburg to Seia | 3,591.46 mi (5,779.90 km) |
| Gaithersburg to Senhora da Hora | 3,525.56 mi (5,673.84 km) |
| Gaithersburg to Serpa | 3,665.15 mi (5,898.49 km) |
| Gaithersburg to Serta | 3,588.81 mi (5,775.63 km) |
