| Tucson to Oberkirch | 5,712.96 mi (9,194.12 km) |
| Tucson to Obernburg am Main | 5,688.07 mi (9,154.07 km) |
| Tucson to Obernkirchen | 5,574.79 mi (8,971.76 km) |
| Tucson to Oberschleissheim | 5,843.33 mi (9,403.93 km) |
| Tucson to Oberstdorf | 5,840.29 mi (9,399.04 km) |
| Tucson to Obertraubling | 5,828.39 mi (9,379.89 km) |
| Tucson to Obertshausen | 5,667.41 mi (9,120.81 km) |
| Tucson to Oberursel | 5,652.65 mi (9,097.06 km) |
| Tucson to Ochsenfurt | 5,727.36 mi (9,217.29 km) |
| Tucson to Ochsenhausen | 5,797.76 mi (9,330.59 km) |
| Tucson to Ochtrup | 5,516.31 mi (8,877.65 km) |
| Tucson to Odenthal | 5,566.72 mi (8,958.76 km) |
| Tucson to Oelde | 5,563.98 mi (8,954.37 km) |
| Tucson to Oelsnitz | 5,758.18 mi (9,266.89 km) |
| Tucson to Oer-Erkenschwick | 5,543.65 mi (8,921.63 km) |
