| Birkenau to Smolyan | 946.70 mi (1,523.56 km) |
| Birkenau to Sofia | 843.30 mi (1,357.17 km) |
| Birkenau to Sopot | 902.03 mi (1,451.68 km) |
| Birkenau to Sozopol | 1,032.75 mi (1,662.05 km) |
| Birkenau to Sredets | 1,014.62 mi (1,632.87 km) |
| Birkenau to Stamboliyski | 915.59 mi (1,473.50 km) |
| Birkenau to Stara Zagora | 947.55 mi (1,524.94 km) |
| Birkenau to Svilengrad | 998.08 mi (1,606.25 km) |
| Birkenau to Svishtov | 887.97 mi (1,429.04 km) |
| Birkenau to Targovishte | 953.58 mi (1,534.63 km) |
| Birkenau to Teteven | 871.37 mi (1,402.33 km) |
| Birkenau to Troyan | 890.96 mi (1,433.86 km) |
| Birkenau to Tryavna | 923.61 mi (1,486.40 km) |
| Birkenau to Tutrakan | 925.69 mi (1,489.76 km) |
| Birkenau to Varna | 1,011.20 mi (1,627.37 km) |
