| Cities | Distance |
|---|---|
| Kastamonu to Popovo | 408.34 mi (657.16 km) |
| Kastamonu to Provadia | 347.35 mi (559.00 km) |
| Kastamonu to Radnevo | 408.60 mi (657.57 km) |
| Kastamonu to Radomir | 561.70 mi (903.96 km) |
| Kastamonu to Rakitovo | 501.68 mi (807.38 km) |
| Kastamonu to Rakovski | 457.74 mi (736.66 km) |
| Kastamonu to Razgrad | 398.79 mi (641.78 km) |
| Kastamonu to Razlog | 533.26 mi (858.20 km) |
| Kastamonu to Ruse | 432.05 mi (695.31 km) |
| Kastamonu to Samokov | 529.83 mi (852.68 km) |
| Kastamonu to Sandanski | 543.11 mi (874.05 km) |
| Kastamonu to Sevlievo | 457.58 mi (736.41 km) |
| Kastamonu to Shumen | 373.41 mi (600.94 km) |
| Kastamonu to Silistra | 380.83 mi (612.89 km) |
| Kastamonu to Sliven | 392.38 mi (631.47 km) |