| Dumbarton to Smolyan | 1,641.40 mi (2,641.57 km) |
| Dumbarton to Sofia | 1,537.11 mi (2,473.74 km) |
| Dumbarton to Sopot | 1,589.85 mi (2,558.61 km) |
| Dumbarton to Sozopol | 1,707.64 mi (2,748.17 km) |
| Dumbarton to Sredets | 1,692.67 mi (2,724.10 km) |
| Dumbarton to Stamboliyski | 1,607.82 mi (2,587.53 km) |
| Dumbarton to Stara Zagora | 1,632.68 mi (2,627.55 km) |
| Dumbarton to Svilengrad | 1,685.34 mi (2,712.29 km) |
| Dumbarton to Svishtov | 1,564.62 mi (2,518.02 km) |
| Dumbarton to Targovishte | 1,626.94 mi (2,618.31 km) |
| Dumbarton to Teteven | 1,559.52 mi (2,509.80 km) |
| Dumbarton to Troyan | 1,577.21 mi (2,538.27 km) |
| Dumbarton to Tryavna | 1,606.10 mi (2,584.77 km) |
| Dumbarton to Tutrakan | 1,590.58 mi (2,559.79 km) |
| Dumbarton to Varna | 1,677.40 mi (2,699.52 km) |
