| Holladay to Orbetello | 5,684.36 mi (9,148.10 km) |
| Holladay to Oria | 5,994.25 mi (9,646.81 km) |
| Holladay to Oristano | 5,728.61 mi (9,219.31 km) |
| Holladay to Orta Nova | 5,888.40 mi (9,476.47 km) |
| Holladay to Orte | 5,721.37 mi (9,207.65 km) |
| Holladay to Ortona | 5,791.43 mi (9,320.41 km) |
| Holladay to Orvieto | 5,698.69 mi (9,171.15 km) |
| Holladay to Orzinuovi | 5,487.42 mi (8,831.14 km) |
| Holladay to Osimo | 5,701.24 mi (9,175.25 km) |
| Holladay to Ospitaletto | 5,483.76 mi (8,825.26 km) |
| Holladay to Ostuni | 5,979.66 mi (9,623.33 km) |
| Holladay to Ottaviano | 5,875.65 mi (9,455.94 km) |
| Holladay to Ovada | 5,485.35 mi (8,827.81 km) |
| Holladay to Ozieri | 5,707.57 mi (9,185.45 km) |
| Holladay to Paceco | 5,967.12 mi (9,603.15 km) |
