| Katy to Orbetello | 5,632.34 mi (9,064.37 km) |
| Katy to Oria | 5,981.30 mi (9,625.97 km) |
| Katy to Oristano | 5,610.85 mi (9,029.79 km) |
| Katy to Orta Nova | 5,866.49 mi (9,441.21 km) |
| Katy to Orte | 5,681.53 mi (9,143.54 km) |
| Katy to Ortona | 5,770.67 mi (9,287.00 km) |
| Katy to Orvieto | 5,659.98 mi (9,108.86 km) |
| Katy to Orzinuovi | 5,469.05 mi (8,801.59 km) |
| Katy to Osimo | 5,688.02 mi (9,153.98 km) |
| Katy to Ospitaletto | 5,469.17 mi (8,801.77 km) |
| Katy to Ostuni | 5,969.49 mi (9,606.96 km) |
| Katy to Ottaviano | 5,833.48 mi (9,388.07 km) |
| Katy to Ovada | 5,442.79 mi (8,759.33 km) |
| Katy to Ozieri | 5,604.57 mi (9,019.68 km) |
| Katy to Paceco | 5,861.55 mi (9,433.26 km) |
