| Willoughby to Sinop | 5,434.65 mi (8,746.23 km) |
| Willoughby to Siran | 5,667.14 mi (9,120.38 km) |
| Willoughby to Sirnak | 5,923.46 mi (9,532.89 km) |
| Willoughby to Sirvan | 5,879.43 mi (9,462.03 km) |
| Willoughby to Sivas | 5,616.56 mi (9,038.98 km) |
| Willoughby to Sivasli | 5,409.05 mi (8,705.03 km) |
| Willoughby to Siverek | 5,802.14 mi (9,337.65 km) |
| Willoughby to Sivrice | 5,765.23 mi (9,278.25 km) |
| Willoughby to Sivrihisar | 5,432.26 mi (8,742.37 km) |
| Willoughby to Sogut | 5,353.52 mi (8,615.67 km) |
| Willoughby to Sogutlu | 5,322.04 mi (8,564.99 km) |
| Willoughby to Soke | 5,355.51 mi (8,618.86 km) |
| Willoughby to Solhan | 5,797.71 mi (9,330.51 km) |
| Willoughby to Soma | 5,294.92 mi (8,521.35 km) |
| Willoughby to Sorgun | 5,548.15 mi (8,928.89 km) |
