| Cernay to Navodari | 1,051.87 mi (1,692.83 km) |
| Cernay to Negresti-Oas | 752.18 mi (1,210.52 km) |
| Cernay to Nehoiu | 921.65 mi (1,483.25 km) |
| Cernay to Ocna Mures | 789.25 mi (1,270.17 km) |
| Cernay to Odobesti | 948.81 mi (1,526.96 km) |
| Cernay to Odorheiu Secuiesc | 857.36 mi (1,379.79 km) |
| Cernay to Oltenita | 966.72 mi (1,555.79 km) |
| Cernay to Onesti | 926.36 mi (1,490.83 km) |
| Cernay to Oradea | 689.90 mi (1,110.29 km) |
| Cernay to Orastie | 768.02 mi (1,236.01 km) |
| Cernay to Oravita | 715.78 mi (1,151.94 km) |
| Cernay to Orsova | 756.10 mi (1,216.82 km) |
| Cernay to Otelu Rosu | 735.53 mi (1,183.72 km) |
| Cernay to Otopeni | 928.93 mi (1,494.96 km) |
| Cernay to Ovidiu | 1,050.67 mi (1,690.89 km) |
