| Kostinbrod to Navodari | 289.40 mi (465.74 km) |
| Kostinbrod to Negresti-Oas | 349.25 mi (562.07 km) |
| Kostinbrod to Nehoiu | 232.78 mi (374.63 km) |
| Kostinbrod to Ocna Mures | 248.91 mi (400.58 km) |
| Kostinbrod to Odobesti | 278.86 mi (448.78 km) |
| Kostinbrod to Odorheiu Secuiesc | 262.50 mi (422.46 km) |
| Kostinbrod to Oltenita | 192.66 mi (310.06 km) |
| Kostinbrod to Onesti | 295.17 mi (475.03 km) |
| Kostinbrod to Oradea | 300.76 mi (484.03 km) |
| Kostinbrod to Orastie | 209.58 mi (337.29 km) |
| Kostinbrod to Oravita | 171.49 mi (275.98 km) |
| Kostinbrod to Orsova | 138.08 mi (222.22 km) |
| Kostinbrod to Otelu Rosu | 191.53 mi (308.23 km) |
| Kostinbrod to Otopeni | 186.17 mi (299.62 km) |
| Kostinbrod to Ovidiu | 285.76 mi (459.88 km) |
