| Cities | Distance |
|---|
| Siena to Smolyan | 691.22 mi (1,112.41 km) |
| Siena to Sofia | 607.20 mi (977.19 km) |
| Siena to Sopot | 679.07 mi (1,092.86 km) |
| Siena to Sozopol | 829.91 mi (1,335.62 km) |
| Siena to Sredets | 805.58 mi (1,296.46 km) |
| Siena to Stamboliyski | 674.35 mi (1,085.25 km) |
| Siena to Stara Zagora | 726.68 mi (1,169.48 km) |
| Siena to Svilengrad | 763.41 mi (1,228.60 km) |
| Siena to Svishtov | 702.44 mi (1,130.46 km) |
| Siena to Targovishte | 766.08 mi (1,232.88 km) |
| Siena to Teteven | 652.33 mi (1,049.82 km) |
| Siena to Troyan | 675.22 mi (1,086.65 km) |
| Siena to Tryavna | 714.70 mi (1,150.21 km) |
| Siena to Tutrakan | 764.31 mi (1,230.03 km) |
| Siena to Varna | 833.08 mi (1,340.71 km) |
