| Tonawanda to Orbetello | 4,328.66 mi (6,966.30 km) |
| Tonawanda to Oria | 4,675.58 mi (7,524.62 km) |
| Tonawanda to Oristano | 4,315.66 mi (6,945.39 km) |
| Tonawanda to Orta Nova | 4,561.07 mi (7,340.34 km) |
| Tonawanda to Orte | 4,376.93 mi (7,043.99 km) |
| Tonawanda to Ortona | 4,464.90 mi (7,185.56 km) |
| Tonawanda to Orvieto | 4,355.21 mi (7,009.04 km) |
| Tonawanda to Orzinuovi | 4,162.38 mi (6,698.70 km) |
| Tonawanda to Osimo | 4,381.56 mi (7,051.45 km) |
| Tonawanda to Ospitaletto | 4,162.30 mi (6,698.58 km) |
| Tonawanda to Ostuni | 4,663.55 mi (7,505.26 km) |
| Tonawanda to Ottaviano | 4,529.62 mi (7,289.72 km) |
| Tonawanda to Ovada | 4,137.62 mi (6,658.85 km) |
| Tonawanda to Ozieri | 4,307.01 mi (6,931.46 km) |
| Tonawanda to Paceco | 4,565.87 mi (7,348.06 km) |
