| Istres to Karlovo | 999.57 mi (1,608.65 km) |
| Istres to Karnobat | 1,108.47 mi (1,783.92 km) |
| Istres to Kavarna | 1,166.61 mi (1,877.47 km) |
| Istres to Kazanlak | 1,029.55 mi (1,656.90 km) |
| Istres to Knezha | 954.72 mi (1,536.48 km) |
| Istres to Kostinbrod | 917.99 mi (1,477.36 km) |
| Istres to Kozloduy | 935.27 mi (1,505.17 km) |
| Istres to Kyustendil | 897.89 mi (1,445.01 km) |
| Istres to Levski | 1,008.14 mi (1,622.45 km) |
| Istres to Lom | 910.38 mi (1,465.12 km) |
| Istres to Lovech | 989.61 mi (1,592.62 km) |
| Istres to Lukovit | 961.51 mi (1,547.40 km) |
| Istres to Lyaskovets | 1,039.82 mi (1,673.43 km) |
| Istres to Mezdra | 938.69 mi (1,510.68 km) |
| Istres to Momchilgrad | 1,046.46 mi (1,684.11 km) |
