| Sinaia to Oberkirch | 850.76 mi (1,369.17 km) |
| Sinaia to Obernburg am Main | 822.99 mi (1,324.48 km) |
| Sinaia to Obernkirchen | 884.33 mi (1,423.19 km) |
| Sinaia to Oberschleissheim | 689.99 mi (1,110.43 km) |
| Sinaia to Oberstdorf | 740.46 mi (1,191.66 km) |
| Sinaia to Obertraubling | 675.49 mi (1,087.10 km) |
| Sinaia to Obertshausen | 840.50 mi (1,352.65 km) |
| Sinaia to Oberursel | 854.07 mi (1,374.49 km) |
| Sinaia to Ochsenfurt | 779.66 mi (1,254.74 km) |
| Sinaia to Ochsenhausen | 761.30 mi (1,225.19 km) |
| Sinaia to Ochtrup | 956.97 mi (1,540.09 km) |
| Sinaia to Odenthal | 932.16 mi (1,500.16 km) |
| Sinaia to Oelde | 909.42 mi (1,463.58 km) |
| Sinaia to Oelsnitz | 710.68 mi (1,143.74 km) |
| Sinaia to Oer-Erkenschwick | 940.40 mi (1,513.42 km) |
