| Sligo to Sestao | 796.39 mi (1,281.66 km) |
| Sligo to Sevilla | 1,182.37 mi (1,902.84 km) |
| Sligo to Sevilla La Nueva | 983.61 mi (1,582.96 km) |
| Sligo to Silla | 1,096.59 mi (1,764.79 km) |
| Sligo to Silleda | 799.26 mi (1,286.29 km) |
| Sligo to Sitges | 1,017.03 mi (1,636.75 km) |
| Sligo to Socuellamos | 1,068.14 mi (1,719.01 km) |
| Sligo to Soller | 1,128.78 mi (1,816.59 km) |
| Sligo to Solsona | 963.09 mi (1,549.94 km) |
| Sligo to Son Servera | 1,152.37 mi (1,854.56 km) |
| Sligo to Sonseca | 1,028.35 mi (1,654.98 km) |
| Sligo to Sopelana | 792.08 mi (1,274.73 km) |
| Sligo to Soria | 906.51 mi (1,458.88 km) |
| Sligo to Suances | 774.79 mi (1,246.90 km) |
| Sligo to Sueca | 1,108.67 mi (1,784.23 km) |
