| Frankfurt to Smolyan | 966.88 mi (1,556.04 km) |
| Frankfurt to Sofia | 863.06 mi (1,388.96 km) |
| Frankfurt to Sopot | 920.16 mi (1,480.86 km) |
| Frankfurt to Sozopol | 1,048.12 mi (1,686.79 km) |
| Frankfurt to Sredets | 1,030.63 mi (1,658.64 km) |
| Frankfurt to Stamboliyski | 934.98 mi (1,504.70 km) |
| Frankfurt to Stara Zagora | 965.08 mi (1,553.14 km) |
| Frankfurt to Svilengrad | 1,016.23 mi (1,635.47 km) |
| Frankfurt to Svishtov | 903.37 mi (1,453.83 km) |
| Frankfurt to Targovishte | 968.44 mi (1,558.56 km) |
| Frankfurt to Teteven | 889.53 mi (1,431.56 km) |
| Frankfurt to Troyan | 908.66 mi (1,462.34 km) |
| Frankfurt to Tryavna | 940.44 mi (1,513.49 km) |
| Frankfurt to Tutrakan | 938.78 mi (1,510.82 km) |
| Frankfurt to Varna | 1,024.79 mi (1,649.23 km) |
