| Birstonas to Smolyan | 900.10 mi (1,448.56 km) |
| Birstonas to Sofia | 823.00 mi (1,324.49 km) |
| Birstonas to Sopot | 826.52 mi (1,330.15 km) |
| Birstonas to Sozopol | 858.35 mi (1,381.38 km) |
| Birstonas to Sredets | 858.79 mi (1,382.09 km) |
| Birstonas to Stamboliyski | 861.87 mi (1,387.05 km) |
| Birstonas to Stara Zagora | 844.07 mi (1,358.40 km) |
| Birstonas to Svilengrad | 892.44 mi (1,436.24 km) |
| Birstonas to Svishtov | 761.41 mi (1,225.37 km) |
| Birstonas to Targovishte | 792.84 mi (1,275.96 km) |
| Birstonas to Teteven | 807.51 mi (1,299.56 km) |
| Birstonas to Troyan | 810.35 mi (1,304.13 km) |
| Birstonas to Tryavna | 813.62 mi (1,309.40 km) |
| Birstonas to Tutrakan | 738.31 mi (1,188.19 km) |
| Birstonas to Varna | 806.03 mi (1,297.18 km) |
