| McCalla to Orbetello | 5,086.35 mi (8,185.68 km) |
| McCalla to Oria | 5,438.62 mi (8,752.62 km) |
| McCalla to Oristano | 5,055.99 mi (8,136.83 km) |
| McCalla to Orta Nova | 5,323.32 mi (8,567.05 km) |
| McCalla to Orte | 5,137.02 mi (8,267.23 km) |
| McCalla to Ortona | 5,228.45 mi (8,414.37 km) |
| McCalla to Orvieto | 5,115.81 mi (8,233.10 km) |
| McCalla to Orzinuovi | 4,929.77 mi (7,933.70 km) |
| McCalla to Osimo | 5,147.70 mi (8,284.43 km) |
| McCalla to Ospitaletto | 4,930.52 mi (7,934.91 km) |
| McCalla to Ostuni | 5,427.35 mi (8,734.47 km) |
| McCalla to Ottaviano | 5,287.44 mi (8,509.32 km) |
| McCalla to Ovada | 4,899.77 mi (7,885.42 km) |
| McCalla to Ozieri | 5,051.62 mi (8,129.79 km) |
| McCalla to Paceco | 5,306.69 mi (8,540.29 km) |
