| Keystone to Santarem | 4,202.59 mi (6,763.42 km) |
| Keystone to Santiago do Cacem | 4,222.62 mi (6,795.65 km) |
| Keystone to Santo Andre | 4,219.40 mi (6,790.48 km) |
| Keystone to Santo Tirso | 4,180.10 mi (6,727.23 km) |
| Keystone to Sao Bras de Alportel | 4,281.34 mi (6,890.16 km) |
| Keystone to Sao Felix da Marinha | 4,176.83 mi (6,721.95 km) |
| Keystone to Sao Joao da Madeira | 4,185.78 mi (6,736.36 km) |
| Keystone to Sao Joao de Ver | 4,181.73 mi (6,729.85 km) |
| Keystone to Sao Mamede de Infesta | 4,175.42 mi (6,719.69 km) |
| Keystone to Sao Pedro do Sul | 4,209.60 mi (6,774.70 km) |
| Keystone to Satao | 4,226.84 mi (6,802.44 km) |
| Keystone to Seia | 4,233.53 mi (6,813.21 km) |
| Keystone to Senhora da Hora | 4,173.05 mi (6,715.88 km) |
| Keystone to Serpa | 4,281.85 mi (6,890.96 km) |
| Keystone to Serta | 4,223.47 mi (6,797.02 km) |
