| Cities | Distance |
|---|---|
| Kocaeli to Popovo | 260.11 mi (418.61 km) |
| Kocaeli to Provadia | 210.36 mi (338.54 km) |
| Kocaeli to Radnevo | 231.81 mi (373.06 km) |
| Kocaeli to Radomir | 380.16 mi (611.80 km) |
| Kocaeli to Rakitovo | 313.97 mi (505.28 km) |
| Kocaeli to Rakovski | 276.95 mi (445.70 km) |
| Kocaeli to Razgrad | 258.80 mi (416.49 km) |
| Kocaeli to Razlog | 343.47 mi (552.77 km) |
| Kocaeli to Ruse | 292.77 mi (471.17 km) |
| Kocaeli to Samokov | 346.39 mi (557.46 km) |
| Kocaeli to Sandanski | 349.49 mi (562.46 km) |
| Kocaeli to Sevlievo | 292.33 mi (470.47 km) |
| Kocaeli to Shumen | 231.91 mi (373.22 km) |
| Kocaeli to Silistra | 268.44 mi (432.01 km) |
| Kocaeli to Sliven | 227.51 mi (366.14 km) |