| Bucharest to Nuth | 1,037.45 mi (1,669.61 km) |
| Bucharest to Oegstgeest | 1,123.28 mi (1,807.74 km) |
| Bucharest to Oirschot | 1,074.06 mi (1,728.54 km) |
| Bucharest to Oisterwijk | 1,080.00 mi (1,738.08 km) |
| Bucharest to Oldebroek | 1,073.65 mi (1,727.87 km) |
| Bucharest to Oldenzaal | 1,030.04 mi (1,657.68 km) |
| Bucharest to Ommen | 1,055.56 mi (1,698.76 km) |
| Bucharest to Oosterend | 1,082.87 mi (1,742.72 km) |
| Bucharest to Oosterhout | 1,095.26 mi (1,762.65 km) |
| Bucharest to Oosterwolde | 1,074.02 mi (1,728.47 km) |
| Bucharest to Oostzaan | 1,112.88 mi (1,791.00 km) |
| Bucharest to Opmeer | 1,117.11 mi (1,797.82 km) |
| Bucharest to Oss | 1,071.44 mi (1,724.32 km) |
| Bucharest to Oud-Beijerland | 1,117.62 mi (1,798.64 km) |
| Bucharest to Oudenbosch | 1,107.65 mi (1,782.59 km) |
