| Klosterneuburg to Navodari | 647.18 mi (1,041.53 km) |
| Klosterneuburg to Negresti-Oas | 329.30 mi (529.95 km) |
| Klosterneuburg to Nehoiu | 513.81 mi (826.90 km) |
| Klosterneuburg to Ocna Mures | 376.89 mi (606.55 km) |
| Klosterneuburg to Odobesti | 535.17 mi (861.27 km) |
| Klosterneuburg to Odorheiu Secuiesc | 442.51 mi (712.16 km) |
| Klosterneuburg to Oltenita | 572.46 mi (921.29 km) |
| Klosterneuburg to Onesti | 509.45 mi (819.88 km) |
| Klosterneuburg to Oradea | 274.14 mi (441.18 km) |
| Klosterneuburg to Orastie | 365.40 mi (588.05 km) |
| Klosterneuburg to Oravita | 339.91 mi (547.03 km) |
| Klosterneuburg to Orsova | 380.19 mi (611.86 km) |
| Klosterneuburg to Otelu Rosu | 343.66 mi (553.07 km) |
| Klosterneuburg to Otopeni | 531.44 mi (855.28 km) |
| Klosterneuburg to Ovidiu | 646.64 mi (1,040.66 km) |
