| Ostrow Wielkopolski to Karlovo | 702.88 mi (1,131.17 km) |
| Ostrow Wielkopolski to Karnobat | 756.13 mi (1,216.88 km) |
| Ostrow Wielkopolski to Kavarna | 748.74 mi (1,204.99 km) |
| Ostrow Wielkopolski to Kazanlak | 717.83 mi (1,155.24 km) |
| Ostrow Wielkopolski to Knezha | 633.77 mi (1,019.96 km) |
| Ostrow Wielkopolski to Kostinbrod | 660.33 mi (1,062.70 km) |
| Ostrow Wielkopolski to Kozloduy | 608.65 mi (979.53 km) |
| Ostrow Wielkopolski to Kyustendil | 686.23 mi (1,104.37 km) |
| Ostrow Wielkopolski to Levski | 665.66 mi (1,071.28 km) |
| Ostrow Wielkopolski to Lom | 595.98 mi (959.13 km) |
| Ostrow Wielkopolski to Lovech | 670.34 mi (1,078.81 km) |
| Ostrow Wielkopolski to Lukovit | 654.34 mi (1,053.06 km) |
| Ostrow Wielkopolski to Lyaskovets | 695.92 mi (1,119.98 km) |
| Ostrow Wielkopolski to Mezdra | 648.01 mi (1,042.86 km) |
| Ostrow Wielkopolski to Momchilgrad | 785.61 mi (1,264.32 km) |
