| Winnetka to Oberkirch | 4,359.16 mi (7,015.38 km) |
| Winnetka to Obernburg am Main | 4,347.99 mi (6,997.42 km) |
| Winnetka to Obernkirchen | 4,254.23 mi (6,846.51 km) |
| Winnetka to Oberschleissheim | 4,501.06 mi (7,243.76 km) |
| Winnetka to Oberstdorf | 4,486.88 mi (7,220.94 km) |
| Winnetka to Obertraubling | 4,493.93 mi (7,232.29 km) |
| Winnetka to Obertshausen | 4,327.88 mi (6,965.04 km) |
| Winnetka to Oberursel | 4,313.19 mi (6,941.41 km) |
| Winnetka to Ochsenfurt | 4,389.48 mi (7,064.18 km) |
| Winnetka to Ochsenhausen | 4,447.73 mi (7,157.93 km) |
| Winnetka to Ochtrup | 4,187.73 mi (6,739.50 km) |
| Winnetka to Odenthal | 4,228.25 mi (6,804.71 km) |
| Winnetka to Oelde | 4,235.97 mi (6,817.13 km) |
| Winnetka to Oelsnitz | 4,434.99 mi (7,137.43 km) |
| Winnetka to Oer-Erkenschwick | 4,210.61 mi (6,776.32 km) |
