| Siegburg to Navodari | 1,088.86 mi (1,752.36 km) |
| Siegburg to Negresti-Oas | 756.10 mi (1,216.83 km) |
| Siegburg to Nehoiu | 955.21 mi (1,537.26 km) |
| Siegburg to Ocna Mures | 817.61 mi (1,315.81 km) |
| Siegburg to Odobesti | 973.52 mi (1,566.73 km) |
| Siegburg to Odorheiu Secuiesc | 880.99 mi (1,417.82 km) |
| Siegburg to Oltenita | 1,015.47 mi (1,634.24 km) |
| Siegburg to Onesti | 945.24 mi (1,521.22 km) |
| Siegburg to Oradea | 714.40 mi (1,149.71 km) |
| Siegburg to Orastie | 808.36 mi (1,300.94 km) |
| Siegburg to Oravita | 777.78 mi (1,251.72 km) |
| Siegburg to Orsova | 818.72 mi (1,317.60 km) |
| Siegburg to Otelu Rosu | 785.79 mi (1,264.60 km) |
| Siegburg to Otopeni | 974.44 mi (1,568.21 km) |
| Siegburg to Ovidiu | 1,088.49 mi (1,751.76 km) |
