| Tucson to Oerlinghausen | 5,574.36 mi (8,971.06 km) |
| Tucson to Oestrich-Winkel | 5,642.89 mi (9,081.36 km) |
| Tucson to Offenburg | 5,710.88 mi (9,190.78 km) |
| Tucson to Oftersheim | 5,691.34 mi (9,159.33 km) |
| Tucson to Ohrdruf | 5,693.16 mi (9,162.26 km) |
| Tucson to Ohringen | 5,729.79 mi (9,221.20 km) |
| Tucson to Olbernhau | 5,782.35 mi (9,305.79 km) |
| Tucson to Olching | 5,837.46 mi (9,394.49 km) |
| Tucson to Oldenburg | 5,506.23 mi (8,861.43 km) |
| Tucson to Oldenburg in Holstein | 5,533.56 mi (8,905.40 km) |
| Tucson to Olfen | 5,544.58 mi (8,923.14 km) |
| Tucson to Olpe | 5,590.98 mi (8,997.81 km) |
| Tucson to Olsberg | 5,596.83 mi (9,007.23 km) |
| Tucson to Oranienburg | 5,677.26 mi (9,136.67 km) |
| Tucson to Ortenberg | 5,661.29 mi (9,110.97 km) |
