| Frankfort to Smolyan | 5,366.59 mi (8,636.69 km) |
| Frankfort to Sofia | 5,263.17 mi (8,470.26 km) |
| Frankfort to Sopot | 5,320.54 mi (8,562.58 km) |
| Frankfort to Sozopol | 5,443.83 mi (8,761.00 km) |
| Frankfort to Sredets | 5,428.00 mi (8,735.53 km) |
| Frankfort to Stamboliyski | 5,335.34 mi (8,586.40 km) |
| Frankfort to Stara Zagora | 5,364.99 mi (8,634.12 km) |
| Frankfort to Svilengrad | 5,416.58 mi (8,717.14 km) |
| Frankfort to Svishtov | 5,299.99 mi (8,529.51 km) |
| Frankfort to Targovishte | 5,363.27 mi (8,631.35 km) |
| Frankfort to Teteven | 5,289.93 mi (8,513.32 km) |
| Frankfort to Troyan | 5,308.78 mi (8,543.65 km) |
| Frankfort to Tryavna | 5,339.58 mi (8,593.22 km) |
| Frankfort to Tutrakan | 5,327.93 mi (8,574.48 km) |
| Frankfort to Varna | 5,414.77 mi (8,714.23 km) |
