| Healdsburg to Solofra | 6,333.97 mi (10,193.54 km) |
| Healdsburg to Somma Lombardo | 5,883.63 mi (9,468.79 km) |
| Healdsburg to Somma Vesuviana | 6,320.27 mi (10,171.49 km) |
| Healdsburg to Sommacampagna | 5,959.59 mi (9,591.03 km) |
| Healdsburg to Sona | 5,957.23 mi (9,587.24 km) |
| Healdsburg to Sondrio | 5,888.97 mi (9,477.38 km) |
| Healdsburg to Sora | 6,248.22 mi (10,055.54 km) |
| Healdsburg to Sorbolo | 5,979.97 mi (9,623.83 km) |
| Healdsburg to Soresina | 5,938.51 mi (9,557.10 km) |
| Healdsburg to Sorisole | 5,907.45 mi (9,507.12 km) |
| Healdsburg to Sorrento | 6,332.85 mi (10,191.73 km) |
| Healdsburg to Sorso | 6,153.51 mi (9,903.12 km) |
| Healdsburg to Sortino | 6,554.66 mi (10,548.70 km) |
| Healdsburg to Soverato Marina | 6,507.80 mi (10,473.29 km) |
| Healdsburg to Sovicille | 6,091.07 mi (9,802.63 km) |
