| Cities | Distance |
|---|---|
| Kocaeli to Smolyan | 277.17 mi (446.06 km) |
| Kocaeli to Sofia | 364.97 mi (587.36 km) |
| Kocaeli to Sopot | 296.67 mi (477.45 km) |
| Kocaeli to Sozopol | 161.84 mi (260.45 km) |
| Kocaeli to Sredets | 178.23 mi (286.83 km) |
| Kocaeli to Stamboliyski | 294.43 mi (473.84 km) |
| Kocaeli to Stara Zagora | 248.85 mi (400.48 km) |
| Kocaeli to Svilengrad | 205.14 mi (330.14 km) |
| Kocaeli to Svishtov | 305.80 mi (492.13 km) |
| Kocaeli to Targovishte | 242.53 mi (390.32 km) |
| Kocaeli to Teteven | 326.65 mi (525.69 km) |
| Kocaeli to Troyan | 305.17 mi (491.13 km) |
| Kocaeli to Tryavna | 269.92 mi (434.40 km) |
| Kocaeli to Tutrakan | 282.70 mi (454.97 km) |
| Kocaeli to Varna | 198.26 mi (319.06 km) |