| Willimantic to Orbetello | 4,089.87 mi (6,582.01 km) |
| Willimantic to Oria | 4,442.45 mi (7,149.43 km) |
| Willimantic to Oristano | 4,060.85 mi (6,535.31 km) |
| Willimantic to Orta Nova | 4,327.09 mi (6,963.78 km) |
| Willimantic to Orte | 4,140.65 mi (6,663.74 km) |
| Willimantic to Ortona | 4,232.39 mi (6,811.37 km) |
| Willimantic to Orvieto | 4,119.49 mi (6,629.68 km) |
| Willimantic to Orzinuovi | 3,934.48 mi (6,331.94 km) |
| Willimantic to Osimo | 4,152.06 mi (6,682.10 km) |
| Willimantic to Ospitaletto | 3,935.42 mi (6,333.44 km) |
| Willimantic to Ostuni | 4,431.26 mi (7,131.43 km) |
| Willimantic to Ottaviano | 4,290.96 mi (6,905.62 km) |
| Willimantic to Ovada | 3,903.65 mi (6,282.32 km) |
| Willimantic to Ozieri | 4,055.83 mi (6,527.23 km) |
| Willimantic to Paceco | 4,311.59 mi (6,938.84 km) |
