| Isselburg to Smolyan | 1,111.63 mi (1,789.00 km) |
| Isselburg to Sofia | 1,007.43 mi (1,621.30 km) |
| Isselburg to Sopot | 1,061.90 mi (1,708.97 km) |
| Isselburg to Sozopol | 1,184.70 mi (1,906.59 km) |
| Isselburg to Sredets | 1,168.43 mi (1,880.41 km) |
| Isselburg to Stamboliyski | 1,078.63 mi (1,735.89 km) |
| Isselburg to Stara Zagora | 1,105.70 mi (1,779.46 km) |
| Isselburg to Svilengrad | 1,157.76 mi (1,863.24 km) |
| Isselburg to Svishtov | 1,040.50 mi (1,674.52 km) |
| Isselburg to Targovishte | 1,104.34 mi (1,777.26 km) |
| Isselburg to Teteven | 1,031.41 mi (1,659.89 km) |
| Isselburg to Troyan | 1,049.73 mi (1,689.38 km) |
| Isselburg to Tryavna | 1,079.97 mi (1,738.04 km) |
| Isselburg to Tutrakan | 1,071.34 mi (1,724.16 km) |
| Isselburg to Varna | 1,158.00 mi (1,863.62 km) |
