| Keystone to Sesena | 4,443.13 mi (7,150.52 km) |
| Keystone to Sestao | 4,417.78 mi (7,109.73 km) |
| Keystone to Sevilla | 4,379.85 mi (7,048.69 km) |
| Keystone to Sevilla La Nueva | 4,421.71 mi (7,116.06 km) |
| Keystone to Silla | 4,625.15 mi (7,443.46 km) |
| Keystone to Silleda | 4,171.16 mi (6,712.83 km) |
| Keystone to Sitges | 4,694.76 mi (7,555.49 km) |
| Keystone to Socuellamos | 4,505.18 mi (7,250.39 km) |
| Keystone to Soller | 4,772.64 mi (7,680.83 km) |
| Keystone to Solsona | 4,664.04 mi (7,506.05 km) |
| Keystone to Son Servera | 4,809.07 mi (7,739.44 km) |
| Keystone to Sonseca | 4,438.09 mi (7,142.42 km) |
| Keystone to Sopelana | 4,417.79 mi (7,109.75 km) |
| Keystone to Soria | 4,472.90 mi (7,198.44 km) |
| Keystone to Suances | 4,364.90 mi (7,024.63 km) |
