| Longford to Sestao | 751.95 mi (1,210.15 km) |
| Longford to Sevilla | 1,142.41 mi (1,838.54 km) |
| Longford to Sevilla La Nueva | 940.99 mi (1,514.38 km) |
| Longford to Silla | 1,051.45 mi (1,692.14 km) |
| Longford to Silleda | 762.15 mi (1,226.56 km) |
| Longford to Sitges | 970.73 mi (1,562.24 km) |
| Longford to Socuellamos | 1,024.64 mi (1,649.00 km) |
| Longford to Soller | 1,082.47 mi (1,742.07 km) |
| Longford to Solsona | 916.75 mi (1,475.37 km) |
| Longford to Son Servera | 1,105.97 mi (1,779.89 km) |
| Longford to Sonseca | 985.81 mi (1,586.51 km) |
| Longford to Sopelana | 747.60 mi (1,203.14 km) |
| Longford to Soria | 862.11 mi (1,387.43 km) |
| Longford to Suances | 731.32 mi (1,176.95 km) |
| Longford to Sueca | 1,063.51 mi (1,711.56 km) |
