| Healdsburg to Sinop | 6,695.72 mi (10,775.72 km) |
| Healdsburg to Siran | 6,873.77 mi (11,062.26 km) |
| Healdsburg to Sirnak | 7,093.64 mi (11,416.10 km) |
| Healdsburg to Sirvan | 7,052.06 mi (11,349.19 km) |
| Healdsburg to Sivas | 6,874.19 mi (11,062.94 km) |
| Healdsburg to Sivasli | 6,831.64 mi (10,994.47 km) |
| Healdsburg to Siverek | 7,039.69 mi (11,329.29 km) |
| Healdsburg to Sivrice | 6,992.95 mi (11,254.06 km) |
| Healdsburg to Sivrihisar | 6,804.31 mi (10,950.49 km) |
| Healdsburg to Sogut | 6,742.33 mi (10,850.73 km) |
| Healdsburg to Sogutlu | 6,691.04 mi (10,768.18 km) |
| Healdsburg to Soke | 6,831.74 mi (10,994.62 km) |
| Healdsburg to Solhan | 6,979.71 mi (11,232.76 km) |
| Healdsburg to Soma | 6,744.48 mi (10,854.20 km) |
| Healdsburg to Sorgun | 6,842.37 mi (11,011.74 km) |
