| Bourne to Smolyan | 1,397.38 mi (2,248.87 km) |
| Bourne to Sofia | 1,293.71 mi (2,082.02 km) |
| Bourne to Sopot | 1,350.97 mi (2,174.17 km) |
| Bourne to Sozopol | 1,477.52 mi (2,377.84 km) |
| Bourne to Sredets | 1,460.54 mi (2,350.51 km) |
| Bourne to Stamboliyski | 1,365.73 mi (2,197.94 km) |
| Bourne to Stara Zagora | 1,395.75 mi (2,246.25 km) |
| Bourne to Svilengrad | 1,447.04 mi (2,328.78 km) |
| Bourne to Svishtov | 1,332.93 mi (2,145.15 km) |
| Bourne to Targovishte | 1,397.48 mi (2,249.02 km) |
| Bourne to Teteven | 1,320.34 mi (2,124.89 km) |
| Bourne to Troyan | 1,339.39 mi (2,155.54 km) |
| Bourne to Tryavna | 1,370.87 mi (2,206.20 km) |
| Bourne to Tutrakan | 1,365.86 mi (2,198.13 km) |
| Bourne to Varna | 1,452.33 mi (2,337.31 km) |
