| Tucson to Nasaud | 6,286.14 mi (10,116.57 km) |
| Tucson to Navodari | 6,569.96 mi (10,573.32 km) |
| Tucson to Negresti-Oas | 6,226.26 mi (10,020.19 km) |
| Tucson to Nehoiu | 6,447.28 mi (10,375.89 km) |
| Tucson to Ocna Mures | 6,320.11 mi (10,171.24 km) |
| Tucson to Odobesti | 6,444.93 mi (10,372.11 km) |
| Tucson to Odorheiu Secuiesc | 6,365.19 mi (10,243.78 km) |
| Tucson to Oltenita | 6,528.23 mi (10,506.18 km) |
| Tucson to Onesti | 6,408.86 mi (10,314.07 km) |
| Tucson to Oradea | 6,226.67 mi (10,020.86 km) |
| Tucson to Orastie | 6,330.69 mi (10,188.27 km) |
| Tucson to Oravita | 6,329.51 mi (10,186.37 km) |
| Tucson to Orsova | 6,368.17 mi (10,248.58 km) |
| Tucson to Otelu Rosu | 6,323.73 mi (10,177.06 km) |
| Tucson to Otopeni | 6,485.93 mi (10,438.09 km) |
