| Healdsburg to Sestu | 6,253.51 mi (10,064.05 km) |
| Healdsburg to Settimo Torinese | 5,887.54 mi (9,475.08 km) |
| Healdsburg to Seveso | 5,898.21 mi (9,492.26 km) |
| Healdsburg to Sezze | 6,245.45 mi (10,051.08 km) |
| Healdsburg to Siano | 6,331.49 mi (10,189.55 km) |
| Healdsburg to Siena | 6,091.84 mi (9,803.86 km) |
| Healdsburg to Signa | 6,058.75 mi (9,750.61 km) |
| Healdsburg to Silea | 5,984.13 mi (9,630.53 km) |
| Healdsburg to Silvi Paese | 6,213.31 mi (9,999.36 km) |
| Healdsburg to Sinalunga | 6,108.95 mi (9,831.41 km) |
| Healdsburg to Siniscola | 6,200.16 mi (9,978.19 km) |
| Healdsburg to Sinnai | 6,256.78 mi (10,069.32 km) |
| Healdsburg to Siracusa | 6,567.74 mi (10,569.75 km) |
| Healdsburg to Solaro | 5,898.30 mi (9,492.40 km) |
| Healdsburg to Soliera | 5,999.36 mi (9,655.04 km) |
