| Chicago Heights to Opole | 4,652.85 mi (7,488.04 km) |
| Chicago Heights to Orzesze | 4,703.26 mi (7,569.16 km) |
| Chicago Heights to Osowa | 4,510.25 mi (7,258.54 km) |
| Chicago Heights to Ostroda | 4,588.99 mi (7,385.26 km) |
| Chicago Heights to Ostroleka | 4,667.70 mi (7,511.94 km) |
| Chicago Heights to Ostrow Mazowiecka | 4,690.20 mi (7,548.15 km) |
| Chicago Heights to Ostrow Wielkopolski | 4,606.72 mi (7,413.80 km) |
| Chicago Heights to Ostrowiec Swietokrzyski | 4,757.75 mi (7,656.86 km) |
| Chicago Heights to Ostrzeszow | 4,620.62 mi (7,436.17 km) |
| Chicago Heights to Oswiecim | 4,724.31 mi (7,603.05 km) |
| Chicago Heights to Otwock | 4,700.38 mi (7,564.54 km) |
| Chicago Heights to Ozarow Mazowiecki | 4,680.79 mi (7,533.01 km) |
| Chicago Heights to Ozimek | 4,662.14 mi (7,502.99 km) |
| Chicago Heights to Ozorkow | 4,642.03 mi (7,470.63 km) |
| Chicago Heights to Pabianice | 4,659.14 mi (7,498.16 km) |
