| Healdsburg to Smolyan | 6,531.26 mi (10,511.04 km) |
| Healdsburg to Sofia | 6,431.49 mi (10,350.49 km) |
| Healdsburg to Sopot | 6,465.44 mi (10,405.12 km) |
| Healdsburg to Sozopol | 6,540.62 mi (10,526.12 km) |
| Healdsburg to Sredets | 6,534.97 mi (10,517.01 km) |
| Healdsburg to Stamboliyski | 6,493.18 mi (10,449.76 km) |
| Healdsburg to Stara Zagora | 6,498.04 mi (10,457.59 km) |
| Healdsburg to Svilengrad | 6,551.58 mi (10,543.75 km) |
| Healdsburg to Svishtov | 6,417.27 mi (10,327.59 km) |
| Healdsburg to Targovishte | 6,465.49 mi (10,405.20 km) |
| Healdsburg to Teteven | 6,438.39 mi (10,361.59 km) |
| Healdsburg to Troyan | 6,450.10 mi (10,380.43 km) |
| Healdsburg to Tryavna | 6,467.59 mi (10,408.58 km) |
| Healdsburg to Tutrakan | 6,415.44 mi (10,324.65 km) |
| Healdsburg to Varna | 6,493.80 mi (10,450.75 km) |
