| Wilmington to Orbetello | 4,636.73 mi (7,462.09 km) |
| Wilmington to Oria | 4,992.89 mi (8,035.28 km) |
| Wilmington to Oristano | 4,590.80 mi (7,388.19 km) |
| Wilmington to Orta Nova | 4,877.29 mi (7,849.24 km) |
| Wilmington to Orte | 4,689.64 mi (7,547.25 km) |
| Wilmington to Ortona | 4,784.41 mi (7,699.76 km) |
| Wilmington to Orvieto | 4,669.11 mi (7,514.20 km) |
| Wilmington to Orzinuovi | 4,491.98 mi (7,229.14 km) |
| Wilmington to Osimo | 4,707.13 mi (7,575.40 km) |
| Wilmington to Ospitaletto | 4,493.75 mi (7,232.00 km) |
| Wilmington to Ostuni | 4,982.53 mi (8,018.60 km) |
| Wilmington to Ottaviano | 4,836.88 mi (7,784.20 km) |
| Wilmington to Ovada | 4,456.01 mi (7,171.25 km) |
| Wilmington to Ozieri | 4,589.98 mi (7,386.85 km) |
| Wilmington to Paceco | 4,840.64 mi (7,790.25 km) |
