| Houthulst to Siran | 1,877.79 mi (3,022.01 km) |
| Houthulst to Sirnak | 2,132.02 mi (3,431.16 km) |
| Houthulst to Sirvan | 2,090.26 mi (3,363.95 km) |
| Houthulst to Sivas | 1,805.49 mi (2,905.65 km) |
| Houthulst to Sivasli | 1,557.12 mi (2,505.94 km) |
| Houthulst to Siverek | 1,988.21 mi (3,199.71 km) |
| Houthulst to Sivrice | 1,957.93 mi (3,150.98 km) |
| Houthulst to Sivrihisar | 1,588.62 mi (2,556.64 km) |
| Houthulst to Sogut | 1,507.99 mi (2,426.87 km) |
| Houthulst to Sogutlu | 1,482.75 mi (2,386.25 km) |
| Houthulst to Soke | 1,502.98 mi (2,418.81 km) |
| Houthulst to Solhan | 2,010.43 mi (3,235.48 km) |
| Houthulst to Soma | 1,441.84 mi (2,320.42 km) |
| Houthulst to Sorgun | 1,725.40 mi (2,776.76 km) |
| Houthulst to Suhut | 1,589.54 mi (2,558.11 km) |
