| Bad Honnef am Rhein to Smolyan | 1,040.86 mi (1,675.11 km) |
| Bad Honnef am Rhein to Sofia | 937.05 mi (1,508.04 km) |
| Bad Honnef am Rhein to Sopot | 994.08 mi (1,599.82 km) |
| Bad Honnef am Rhein to Sozopol | 1,121.55 mi (1,804.96 km) |
| Bad Honnef am Rhein to Sredets | 1,104.21 mi (1,777.06 km) |
| Bad Honnef am Rhein to Stamboliyski | 1,008.97 mi (1,623.78 km) |
| Bad Honnef am Rhein to Stara Zagora | 1,038.93 mi (1,671.99 km) |
| Bad Honnef am Rhein to Svilengrad | 1,090.15 mi (1,754.43 km) |
| Bad Honnef am Rhein to Svishtov | 976.83 mi (1,572.06 km) |
| Bad Honnef am Rhein to Targovishte | 1,041.75 mi (1,676.54 km) |
| Bad Honnef am Rhein to Teteven | 963.46 mi (1,550.53 km) |
| Bad Honnef am Rhein to Troyan | 982.54 mi (1,581.24 km) |
| Bad Honnef am Rhein to Tryavna | 1,014.19 mi (1,632.19 km) |
| Bad Honnef am Rhein to Tutrakan | 1,011.53 mi (1,627.90 km) |
| Bad Honnef am Rhein to Varna | 1,097.69 mi (1,766.56 km) |
