| Willebroek to Siran | 1,818.23 mi (2,926.15 km) |
| Willebroek to Sirnak | 2,072.81 mi (3,335.86 km) |
| Willebroek to Sirvan | 2,030.91 mi (3,268.44 km) |
| Willebroek to Sivas | 1,746.87 mi (2,811.32 km) |
| Willebroek to Sivasli | 1,503.57 mi (2,419.76 km) |
| Willebroek to Siverek | 1,929.95 mi (3,105.95 km) |
| Willebroek to Sivrice | 1,899.27 mi (3,056.57 km) |
| Willebroek to Sivrihisar | 1,532.85 mi (2,466.89 km) |
| Willebroek to Sogut | 1,452.51 mi (2,337.59 km) |
| Willebroek to Sogutlu | 1,426.22 mi (2,295.28 km) |
| Willebroek to Soke | 1,452.20 mi (2,337.09 km) |
| Willebroek to Solhan | 1,950.93 mi (3,139.72 km) |
| Willebroek to Soma | 1,389.19 mi (2,235.68 km) |
| Willebroek to Sorgun | 1,667.46 mi (2,683.52 km) |
| Willebroek to Suhut | 1,535.31 mi (2,470.83 km) |
