| Cities | Distance |
|---|---|
| Bolu to Smolyan | 363.97 mi (585.76 km) |
| Bolu to Sofia | 447.75 mi (720.59 km) |
| Bolu to Sopot | 377.60 mi (607.69 km) |
| Bolu to Sozopol | 232.98 mi (374.95 km) |
| Bolu to Sredets | 253.74 mi (408.36 km) |
| Bolu to Stamboliyski | 378.85 mi (609.69 km) |
| Bolu to Stara Zagora | 329.40 mi (530.13 km) |
| Bolu to Svilengrad | 289.75 mi (466.31 km) |
| Bolu to Svishtov | 377.09 mi (606.86 km) |
| Bolu to Targovishte | 310.99 mi (500.49 km) |
| Bolu to Teteven | 406.73 mi (654.57 km) |
| Bolu to Troyan | 384.52 mi (618.83 km) |
| Bolu to Tryavna | 347.25 mi (558.84 km) |
| Bolu to Tutrakan | 342.41 mi (551.06 km) |
| Bolu to Varna | 255.59 mi (411.33 km) |