| Sliven to Kalisz | 735.89 mi (1,184.30 km) |
| Sliven to Kamien Pomorski | 940.90 mi (1,514.23 km) |
| Sliven to Kamienna Gora | 740.98 mi (1,192.49 km) |
| Sliven to Karczew | 691.21 mi (1,112.40 km) |
| Sliven to Kartuzy | 885.49 mi (1,425.05 km) |
| Sliven to Katowice | 628.40 mi (1,011.31 km) |
| Sliven to Kedzierzyn-Kozle | 655.01 mi (1,054.14 km) |
| Sliven to Kepno | 711.72 mi (1,145.40 km) |
| Sliven to Ketrzyn | 819.25 mi (1,318.46 km) |
| Sliven to Kety | 602.77 mi (970.07 km) |
| Sliven to Kielce | 626.46 mi (1,008.18 km) |
| Sliven to Kielczow | 725.57 mi (1,167.70 km) |
| Sliven to Klobuck | 667.16 mi (1,073.69 km) |
| Sliven to Klodzko | 704.78 mi (1,134.23 km) |
| Sliven to Kluczbork | 689.06 mi (1,108.93 km) |
