| Gelnhausen to Smolyan | 951.99 mi (1,532.07 km) |
| Gelnhausen to Sofia | 848.00 mi (1,364.72 km) |
| Gelnhausen to Sopot | 904.28 mi (1,455.30 km) |
| Gelnhausen to Sozopol | 1,030.97 mi (1,659.19 km) |
| Gelnhausen to Sredets | 1,013.76 mi (1,631.48 km) |
| Gelnhausen to Stamboliyski | 919.70 mi (1,480.11 km) |
| Gelnhausen to Stara Zagora | 948.89 mi (1,527.10 km) |
| Gelnhausen to Svilengrad | 1,000.32 mi (1,609.86 km) |
| Gelnhausen to Svishtov | 886.29 mi (1,426.35 km) |
| Gelnhausen to Targovishte | 951.12 mi (1,530.68 km) |
| Gelnhausen to Teteven | 873.68 mi (1,406.04 km) |
| Gelnhausen to Troyan | 892.58 mi (1,436.47 km) |
| Gelnhausen to Tryavna | 923.96 mi (1,486.97 km) |
| Gelnhausen to Tutrakan | 920.78 mi (1,481.85 km) |
| Gelnhausen to Varna | 1,006.94 mi (1,620.52 km) |
