| Hilliard to Orbetello | 4,628.01 mi (7,448.06 km) |
| Hilliard to Oria | 4,975.79 mi (8,007.77 km) |
| Hilliard to Oristano | 4,612.00 mi (7,422.30 km) |
| Hilliard to Orta Nova | 4,861.15 mi (7,823.27 km) |
| Hilliard to Orte | 4,676.65 mi (7,526.34 km) |
| Hilliard to Ortona | 4,765.13 mi (7,668.73 km) |
| Hilliard to Orvieto | 4,655.00 mi (7,491.50 km) |
| Hilliard to Orzinuovi | 4,463.02 mi (7,182.54 km) |
| Hilliard to Osimo | 4,682.10 mi (7,535.12 km) |
| Hilliard to Ospitaletto | 4,463.05 mi (7,182.58 km) |
| Hilliard to Ostuni | 4,963.86 mi (7,988.56 km) |
| Hilliard to Ottaviano | 4,829.06 mi (7,771.62 km) |
| Hilliard to Ovada | 4,437.56 mi (7,141.57 km) |
| Hilliard to Ozieri | 4,604.14 mi (7,409.65 km) |
| Hilliard to Paceco | 4,862.44 mi (7,825.34 km) |
