| Heiloo to Navodari | 1,227.27 mi (1,975.10 km) |
| Heiloo to Negresti-Oas | 885.85 mi (1,425.64 km) |
| Heiloo to Nehoiu | 1,093.81 mi (1,760.32 km) |
| Heiloo to Ocna Mures | 956.28 mi (1,538.99 km) |
| Heiloo to Odobesti | 1,108.27 mi (1,783.59 km) |
| Heiloo to Odorheiu Secuiesc | 1,016.70 mi (1,636.22 km) |
| Heiloo to Oltenita | 1,159.09 mi (1,865.38 km) |
| Heiloo to Onesti | 1,077.92 mi (1,734.74 km) |
| Heiloo to Oradea | 853.66 mi (1,373.83 km) |
| Heiloo to Orastie | 951.64 mi (1,531.52 km) |
| Heiloo to Oravita | 928.44 mi (1,494.18 km) |
| Heiloo to Orsova | 969.05 mi (1,559.54 km) |
| Heiloo to Otelu Rosu | 932.76 mi (1,501.13 km) |
| Heiloo to Otopeni | 1,117.33 mi (1,798.17 km) |
| Heiloo to Ovidiu | 1,227.24 mi (1,975.05 km) |
