| Smolyan to Sestao | 1,411.07 mi (2,270.90 km) |
| Smolyan to Sevilla | 1,656.48 mi (2,665.85 km) |
| Smolyan to Sevilla La Nueva | 1,494.36 mi (2,404.94 km) |
| Smolyan to Silla | 1,323.98 mi (2,130.73 km) |
| Smolyan to Silleda | 1,678.29 mi (2,700.94 km) |
| Smolyan to Sitges | 1,183.24 mi (1,904.24 km) |
| Smolyan to Socuellamos | 1,448.30 mi (2,330.81 km) |
| Smolyan to Soller | 1,156.48 mi (1,861.18 km) |
| Smolyan to Solsona | 1,190.95 mi (1,916.64 km) |
| Smolyan to Son Servera | 1,124.74 mi (1,810.10 km) |
| Smolyan to Sonseca | 1,500.77 mi (2,415.25 km) |
| Smolyan to Sopelana | 1,409.36 mi (2,268.14 km) |
| Smolyan to Soria | 1,396.20 mi (2,246.96 km) |
| Smolyan to Suances | 1,462.63 mi (2,353.87 km) |
| Smolyan to Sueca | 1,321.70 mi (2,127.07 km) |
