| Redding to Orbetello | 6,010.68 mi (9,673.26 km) |
| Redding to Oria | 6,297.91 mi (10,135.51 km) |
| Redding to Oristano | 6,078.70 mi (9,782.73 km) |
| Redding to Orta Nova | 6,198.16 mi (9,974.98 km) |
| Redding to Orte | 6,042.11 mi (9,723.84 km) |
| Redding to Ortona | 6,103.06 mi (9,821.93 km) |
| Redding to Orvieto | 6,019.53 mi (9,687.50 km) |
| Redding to Orzinuovi | 5,805.41 mi (9,342.91 km) |
| Redding to Osimo | 6,012.07 mi (9,675.49 km) |
| Redding to Ospitaletto | 5,800.38 mi (9,334.81 km) |
| Redding to Ostuni | 6,282.56 mi (10,110.81 km) |
| Redding to Ottaviano | 6,193.67 mi (9,967.74 km) |
| Redding to Ovada | 5,812.72 mi (9,354.66 km) |
| Redding to Ozieri | 6,052.65 mi (9,740.80 km) |
| Redding to Paceco | 6,307.36 mi (10,150.71 km) |
