| Troisdorf to Navodari | 1,091.19 mi (1,756.10 km) |
| Troisdorf to Negresti-Oas | 758.37 mi (1,220.47 km) |
| Troisdorf to Nehoiu | 957.53 mi (1,541.00 km) |
| Troisdorf to Ocna Mures | 819.93 mi (1,319.55 km) |
| Troisdorf to Odobesti | 975.83 mi (1,570.44 km) |
| Troisdorf to Odorheiu Secuiesc | 883.30 mi (1,421.54 km) |
| Troisdorf to Oltenita | 1,017.82 mi (1,638.02 km) |
| Troisdorf to Onesti | 947.54 mi (1,524.91 km) |
| Troisdorf to Oradea | 716.72 mi (1,153.45 km) |
| Troisdorf to Orastie | 810.71 mi (1,304.71 km) |
| Troisdorf to Oravita | 780.14 mi (1,255.52 km) |
| Troisdorf to Orsova | 821.08 mi (1,321.40 km) |
| Troisdorf to Otelu Rosu | 788.14 mi (1,268.39 km) |
| Troisdorf to Otopeni | 976.78 mi (1,571.98 km) |
| Troisdorf to Ovidiu | 1,090.82 mi (1,755.51 km) |
