| Sliven to Sestao | 1,475.60 mi (2,374.74 km) |
| Sliven to Sevilla | 1,741.35 mi (2,802.42 km) |
| Sliven to Sevilla La Nueva | 1,570.55 mi (2,527.55 km) |
| Sliven to Silla | 1,406.77 mi (2,263.98 km) |
| Sliven to Silleda | 1,742.99 mi (2,805.07 km) |
| Sliven to Sitges | 1,259.83 mi (2,027.50 km) |
| Sliven to Socuellamos | 1,529.32 mi (2,461.20 km) |
| Sliven to Soller | 1,240.38 mi (1,996.19 km) |
| Sliven to Solsona | 1,263.71 mi (2,033.75 km) |
| Sliven to Son Servera | 1,209.87 mi (1,947.09 km) |
| Sliven to Sonseca | 1,579.39 mi (2,541.78 km) |
| Sliven to Sopelana | 1,473.57 mi (2,371.49 km) |
| Sliven to Soria | 1,467.75 mi (2,362.12 km) |
| Sliven to Suances | 1,526.21 mi (2,456.20 km) |
| Sliven to Sueca | 1,405.18 mi (2,261.42 km) |
