| Langenfeld to Navodari | 1,105.60 mi (1,779.30 km) |
| Langenfeld to Negresti-Oas | 770.74 mi (1,240.39 km) |
| Langenfeld to Nehoiu | 971.92 mi (1,564.15 km) |
| Langenfeld to Ocna Mures | 834.23 mi (1,342.57 km) |
| Langenfeld to Odobesti | 989.42 mi (1,592.31 km) |
| Langenfeld to Odorheiu Secuiesc | 897.02 mi (1,443.62 km) |
| Langenfeld to Oltenita | 1,033.32 mi (1,662.97 km) |
| Langenfeld to Onesti | 960.68 mi (1,546.07 km) |
| Langenfeld to Oradea | 731.05 mi (1,176.52 km) |
| Langenfeld to Orastie | 826.02 mi (1,329.34 km) |
| Langenfeld to Oravita | 797.18 mi (1,282.93 km) |
| Langenfeld to Orsova | 838.06 mi (1,348.72 km) |
| Langenfeld to Otelu Rosu | 804.29 mi (1,294.37 km) |
| Langenfeld to Otopeni | 992.11 mi (1,596.64 km) |
| Langenfeld to Ovidiu | 1,105.31 mi (1,778.82 km) |
