| Bonn to Navodari | 1,091.98 mi (1,757.37 km) |
| Bonn to Negresti-Oas | 759.87 mi (1,222.90 km) |
| Bonn to Nehoiu | 958.34 mi (1,542.30 km) |
| Bonn to Ocna Mures | 820.78 mi (1,320.92 km) |
| Bonn to Odobesti | 976.91 mi (1,572.18 km) |
| Bonn to Odorheiu Secuiesc | 884.35 mi (1,423.22 km) |
| Bonn to Oltenita | 1,018.21 mi (1,638.65 km) |
| Bonn to Onesti | 948.77 mi (1,526.89 km) |
| Bonn to Oradea | 717.57 mi (1,154.82 km) |
| Bonn to Orastie | 811.19 mi (1,305.48 km) |
| Bonn to Oravita | 779.94 mi (1,255.19 km) |
| Bonn to Orsova | 820.90 mi (1,321.11 km) |
| Bonn to Otelu Rosu | 788.30 mi (1,268.65 km) |
| Bonn to Otopeni | 977.24 mi (1,572.72 km) |
| Bonn to Ovidiu | 1,091.58 mi (1,756.73 km) |
