| Heidelberg to Smolyan | 941.41 mi (1,515.06 km) |
| Heidelberg to Sofia | 838.16 mi (1,348.89 km) |
| Heidelberg to Sopot | 897.30 mi (1,444.07 km) |
| Heidelberg to Sozopol | 1,028.73 mi (1,655.58 km) |
| Heidelberg to Sredets | 1,010.43 mi (1,626.13 km) |
| Heidelberg to Stamboliyski | 910.53 mi (1,465.35 km) |
| Heidelberg to Stara Zagora | 942.97 mi (1,517.57 km) |
| Heidelberg to Svilengrad | 993.33 mi (1,598.61 km) |
| Heidelberg to Svishtov | 883.97 mi (1,422.61 km) |
| Heidelberg to Targovishte | 949.71 mi (1,528.40 km) |
| Heidelberg to Teteven | 866.64 mi (1,394.72 km) |
| Heidelberg to Troyan | 886.35 mi (1,426.45 km) |
| Heidelberg to Tryavna | 919.22 mi (1,479.34 km) |
| Heidelberg to Tutrakan | 922.30 mi (1,484.30 km) |
| Heidelberg to Varna | 1,007.65 mi (1,621.66 km) |
