| Longford to Siran | 2,350.03 mi (3,782.00 km) |
| Longford to Sirnak | 2,606.19 mi (4,194.26 km) |
| Longford to Sirvan | 2,563.62 mi (4,125.76 km) |
| Longford to Sivas | 2,283.55 mi (3,675.02 km) |
| Longford to Sivasli | 2,047.55 mi (3,295.22 km) |
| Longford to Siverek | 2,467.77 mi (3,971.49 km) |
| Longford to Sivrice | 2,435.56 mi (3,919.65 km) |
| Longford to Sivrihisar | 2,076.13 mi (3,341.21 km) |
| Longford to Sogut | 1,996.06 mi (3,212.34 km) |
| Longford to Sogutlu | 1,968.63 mi (3,168.20 km) |
| Longford to Soke | 1,994.13 mi (3,209.24 km) |
| Longford to Solhan | 2,482.87 mi (3,995.79 km) |
| Longford to Soma | 1,932.79 mi (3,110.53 km) |
| Longford to Sorgun | 2,206.62 mi (3,551.22 km) |
| Longford to Suhut | 2,079.34 mi (3,346.38 km) |
