| Donauworth to Navodari | 896.92 mi (1,443.45 km) |
| Donauworth to Negresti-Oas | 582.57 mi (937.56 km) |
| Donauworth to Nehoiu | 764.41 mi (1,230.21 km) |
| Donauworth to Ocna Mures | 628.79 mi (1,011.93 km) |
| Donauworth to Odobesti | 787.91 mi (1,268.02 km) |
| Donauworth to Odorheiu Secuiesc | 695.45 mi (1,119.21 km) |
| Donauworth to Oltenita | 817.26 mi (1,315.25 km) |
| Donauworth to Onesti | 763.02 mi (1,227.97 km) |
| Donauworth to Oradea | 526.91 mi (847.97 km) |
| Donauworth to Orastie | 612.90 mi (986.37 km) |
| Donauworth to Oravita | 572.27 mi (920.98 km) |
| Donauworth to Orsova | 613.30 mi (987.01 km) |
| Donauworth to Otelu Rosu | 585.31 mi (941.96 km) |
| Donauworth to Otopeni | 777.55 mi (1,251.35 km) |
| Donauworth to Ovidiu | 896.11 mi (1,442.15 km) |
