| Frondenberg to Navodari | 1,079.57 mi (1,737.40 km) |
| Frondenberg to Negresti-Oas | 741.35 mi (1,193.08 km) |
| Frondenberg to Nehoiu | 945.94 mi (1,522.34 km) |
| Frondenberg to Ocna Mures | 808.25 mi (1,300.75 km) |
| Frondenberg to Odobesti | 961.91 mi (1,548.05 km) |
| Frondenberg to Odorheiu Secuiesc | 869.85 mi (1,399.89 km) |
| Frondenberg to Oltenita | 1,009.61 mi (1,624.80 km) |
| Frondenberg to Onesti | 932.40 mi (1,500.55 km) |
| Frondenberg to Oradea | 705.29 mi (1,135.05 km) |
| Frondenberg to Orastie | 802.11 mi (1,290.88 km) |
| Frondenberg to Oravita | 777.38 mi (1,251.07 km) |
| Frondenberg to Orsova | 818.04 mi (1,316.51 km) |
| Frondenberg to Otelu Rosu | 782.29 mi (1,258.98 km) |
| Frondenberg to Otopeni | 968.04 mi (1,557.91 km) |
| Frondenberg to Ovidiu | 1,079.41 mi (1,737.15 km) |
