| Sonoma to Smolyan | 6,543.37 mi (10,530.54 km) |
| Sonoma to Sofia | 6,443.38 mi (10,369.62 km) |
| Sonoma to Sopot | 6,477.80 mi (10,425.02 km) |
| Sonoma to Sozopol | 6,553.95 mi (10,547.56 km) |
| Sonoma to Sredets | 6,548.10 mi (10,538.15 km) |
| Sonoma to Stamboliyski | 6,505.35 mi (10,469.36 km) |
| Sonoma to Stara Zagora | 6,510.67 mi (10,477.91 km) |
| Sonoma to Svilengrad | 6,564.26 mi (10,564.15 km) |
| Sonoma to Svishtov | 6,430.04 mi (10,348.15 km) |
| Sonoma to Targovishte | 6,478.60 mi (10,426.30 km) |
| Sonoma to Teteven | 6,450.65 mi (10,381.32 km) |
| Sonoma to Troyan | 6,462.50 mi (10,400.39 km) |
| Sonoma to Tryavna | 6,480.26 mi (10,428.96 km) |
| Sonoma to Tutrakan | 6,428.72 mi (10,346.02 km) |
| Sonoma to Varna | 6,507.35 mi (10,472.57 km) |
