| Kastamonu to Devnya | 341.77 mi (550.03 km) |
| Kastamonu to Dimitrovgrad | 424.11 mi (682.54 km) |
| Kastamonu to Dobrich | 338.47 mi (544.72 km) |
| Kastamonu to Dospat | 497.28 mi (800.30 km) |
| Kastamonu to Dupnitsa | 551.84 mi (888.10 km) |
| Kastamonu to Elhovo | 375.39 mi (604.13 km) |
| Kastamonu to Etropole | 510.85 mi (822.13 km) |
| Kastamonu to Gabrovo | 444.56 mi (715.46 km) |
| Kastamonu to Gorna Oryahovitsa | 430.30 mi (692.49 km) |
| Kastamonu to Gotse Delchev | 519.81 mi (836.55 km) |
| Kastamonu to Harmanli | 408.28 mi (657.06 km) |
| Kastamonu to Haskovo | 425.39 mi (684.61 km) |
| Kastamonu to Ihtiman | 517.07 mi (832.14 km) |
| Kastamonu to Isperih | 388.49 mi (625.21 km) |
| Kastamonu to Kardzhali | 435.33 mi (700.60 km) |
