| Nea Ionia to Navodari | 502.47 mi (808.65 km) |
| Nea Ionia to Negresti-Oas | 679.81 mi (1,094.04 km) |
| Nea Ionia to Nehoiu | 522.57 mi (840.99 km) |
| Nea Ionia to Ocna Mures | 577.42 mi (929.27 km) |
| Nea Ionia to Odobesti | 560.75 mi (902.44 km) |
| Nea Ionia to Odorheiu Secuiesc | 577.59 mi (929.54 km) |
| Nea Ionia to Oltenita | 444.39 mi (715.17 km) |
| Nea Ionia to Onesti | 588.86 mi (947.68 km) |
| Nea Ionia to Oradea | 631.38 mi (1,016.10 km) |
| Nea Ionia to Orastie | 540.82 mi (870.36 km) |
| Nea Ionia to Oravita | 495.72 mi (797.79 km) |
| Nea Ionia to Orsova | 467.65 mi (752.61 km) |
| Nea Ionia to Otelu Rosu | 522.15 mi (840.31 km) |
| Nea Ionia to Otopeni | 466.03 mi (750.01 km) |
| Nea Ionia to Ovidiu | 498.08 mi (801.59 km) |
