| Buffalo to Oberkirch | 3,978.63 mi (6,402.99 km) |
| Buffalo to Obernburg am Main | 3,975.09 mi (6,397.29 km) |
| Buffalo to Obernkirchen | 3,892.62 mi (6,264.57 km) |
| Buffalo to Oberschleissheim | 4,125.74 mi (6,639.74 km) |
| Buffalo to Oberstdorf | 4,105.63 mi (6,607.38 km) |
| Buffalo to Obertraubling | 4,122.83 mi (6,635.05 km) |
| Buffalo to Obertshausen | 3,955.44 mi (6,365.66 km) |
| Buffalo to Oberursel | 3,940.91 mi (6,342.29 km) |
| Buffalo to Ochsenfurt | 4,017.41 mi (6,465.40 km) |
| Buffalo to Ochsenhausen | 4,068.63 mi (6,547.82 km) |
| Buffalo to Ochtrup | 3,822.48 mi (6,151.68 km) |
| Buffalo to Odenthal | 3,857.25 mi (6,207.65 km) |
| Buffalo to Oelde | 3,870.56 mi (6,229.07 km) |
| Buffalo to Oelsnitz | 4,070.32 mi (6,550.54 km) |
| Buffalo to Oer-Erkenschwick | 3,842.73 mi (6,184.28 km) |
