| Deerfield to Orbetello | 4,731.59 mi (7,614.76 km) |
| Deerfield to Oria | 5,072.31 mi (8,163.10 km) |
| Deerfield to Oristano | 4,731.47 mi (7,614.57 km) |
| Deerfield to Orta Nova | 4,959.02 mi (7,980.77 km) |
| Deerfield to Orte | 4,777.58 mi (7,688.78 km) |
| Deerfield to Ortona | 4,862.01 mi (7,824.65 km) |
| Deerfield to Orvieto | 4,755.50 mi (7,653.24 km) |
| Deerfield to Orzinuovi | 4,556.99 mi (7,333.77 km) |
| Deerfield to Osimo | 4,776.50 mi (7,687.03 km) |
| Deerfield to Ospitaletto | 4,556.06 mi (7,332.28 km) |
| Deerfield to Ostuni | 5,059.62 mi (8,142.67 km) |
| Deerfield to Ottaviano | 4,931.63 mi (7,936.70 km) |
| Deerfield to Ovada | 4,537.42 mi (7,302.27 km) |
| Deerfield to Ozieri | 4,720.01 mi (7,596.12 km) |
| Deerfield to Paceco | 4,980.43 mi (8,015.22 km) |
