| West Chicago to Opole | 4,652.97 mi (7,488.23 km) |
| West Chicago to Orzesze | 4,703.43 mi (7,569.44 km) |
| West Chicago to Osowa | 4,507.93 mi (7,254.82 km) |
| West Chicago to Ostroda | 4,586.69 mi (7,381.56 km) |
| West Chicago to Ostroleka | 4,665.31 mi (7,508.09 km) |
| West Chicago to Ostrow Mazowiecka | 4,687.86 mi (7,544.38 km) |
| West Chicago to Ostrow Wielkopolski | 4,606.28 mi (7,413.09 km) |
| West Chicago to Ostrowiec Swietokrzyski | 4,756.64 mi (7,655.07 km) |
| West Chicago to Ostrzeszow | 4,620.29 mi (7,435.63 km) |
| West Chicago to Oswiecim | 4,724.40 mi (7,603.19 km) |
| West Chicago to Otwock | 4,698.63 mi (7,561.72 km) |
| West Chicago to Ozarow Mazowiecki | 4,679.13 mi (7,530.33 km) |
| West Chicago to Ozimek | 4,662.17 mi (7,503.03 km) |
| West Chicago to Ozorkow | 4,640.96 mi (7,468.91 km) |
| West Chicago to Pabianice | 4,658.23 mi (7,496.70 km) |
