| Cities | Distance |
|---|---|
| Sliven to Navodari | 160.80 mi (258.79 km) |
| Sliven to Negresti-Oas | 385.16 mi (619.85 km) |
| Sliven to Nehoiu | 184.47 mi (296.88 km) |
| Sliven to Ocna Mures | 283.56 mi (456.35 km) |
| Sliven to Odobesti | 216.11 mi (347.80 km) |
| Sliven to Odorheiu Secuiesc | 255.94 mi (411.90 km) |
| Sliven to Oltenita | 98.15 mi (157.96 km) |
| Sliven to Onesti | 247.96 mi (399.06 km) |
| Sliven to Oradea | 372.18 mi (598.97 km) |
| Sliven to Orastie | 268.10 mi (431.47 km) |
| Sliven to Oravita | 283.01 mi (455.46 km) |
| Sliven to Orsova | 241.99 mi (389.44 km) |
| Sliven to Otelu Rosu | 278.11 mi (447.57 km) |
| Sliven to Otopeni | 129.65 mi (208.65 km) |
| Sliven to Ovidiu | 156.46 mi (251.79 km) |