| Istres to Smolyan | 1,009.70 mi (1,624.95 km) |
| Istres to Sofia | 924.99 mi (1,488.62 km) |
| Istres to Sopot | 996.63 mi (1,603.92 km) |
| Istres to Sozopol | 1,147.17 mi (1,846.19 km) |
| Istres to Sredets | 1,123.10 mi (1,807.45 km) |
| Istres to Stamboliyski | 992.69 mi (1,597.57 km) |
| Istres to Stara Zagora | 1,044.42 mi (1,680.84 km) |
| Istres to Svilengrad | 1,081.82 mi (1,741.02 km) |
| Istres to Svishtov | 1,016.78 mi (1,636.36 km) |
| Istres to Targovishte | 1,081.46 mi (1,740.43 km) |
| Istres to Teteven | 969.39 mi (1,560.08 km) |
| Istres to Troyan | 992.24 mi (1,596.86 km) |
| Istres to Tryavna | 1,031.55 mi (1,660.13 km) |
| Istres to Tutrakan | 1,076.37 mi (1,732.25 km) |
| Istres to Varna | 1,148.16 mi (1,847.78 km) |
