| Bucharest to Opole | 574.40 mi (924.40 km) |
| Bucharest to Orzesze | 523.73 mi (842.87 km) |
| Bucharest to Osowa | 770.01 mi (1,239.21 km) |
| Bucharest to Ostroda | 697.36 mi (1,122.30 km) |
| Bucharest to Ostroleka | 631.04 mi (1,015.55 km) |
| Bucharest to Ostrow Mazowiecka | 608.92 mi (979.97 km) |
| Bucharest to Ostrow Wielkopolski | 627.82 mi (1,010.38 km) |
| Bucharest to Ostrowiec Swietokrzyski | 499.37 mi (803.66 km) |
| Bucharest to Ostrzeszow | 612.38 mi (985.53 km) |
| Bucharest to Oswiecim | 503.80 mi (810.80 km) |
| Bucharest to Otwock | 575.32 mi (925.89 km) |
| Bucharest to Ozarow Mazowiecki | 590.07 mi (949.62 km) |
| Bucharest to Ozimek | 566.20 mi (911.21 km) |
| Bucharest to Ozorkow | 607.38 mi (977.48 km) |
| Bucharest to Pabianice | 586.86 mi (944.46 km) |
