| Ostend to Siran | 1,881.91 mi (3,028.65 km) |
| Ostend to Sirnak | 2,136.48 mi (3,438.33 km) |
| Ostend to Sirvan | 2,094.59 mi (3,370.92 km) |
| Ostend to Sivas | 1,810.46 mi (2,913.65 km) |
| Ostend to Sivasli | 1,565.18 mi (2,518.92 km) |
| Ostend to Siverek | 1,993.46 mi (3,208.17 km) |
| Ostend to Sivrice | 1,962.86 mi (3,158.92 km) |
| Ostend to Sivrihisar | 1,595.52 mi (2,567.74 km) |
| Ostend to Sogut | 1,515.05 mi (2,438.24 km) |
| Ostend to Sogutlu | 1,489.19 mi (2,396.62 km) |
| Ostend to Soke | 1,512.25 mi (2,433.74 km) |
| Ostend to Solhan | 2,014.62 mi (3,242.22 km) |
| Ostend to Soma | 1,450.31 mi (2,334.05 km) |
| Ostend to Sorgun | 1,730.89 mi (2,785.60 km) |
| Ostend to Suhut | 1,597.27 mi (2,570.55 km) |
