| Mount Prospect to Opole | 4,634.48 mi (7,458.48 km) |
| Mount Prospect to Orzesze | 4,684.94 mi (7,539.68 km) |
| Mount Prospect to Osowa | 4,489.69 mi (7,225.45 km) |
| Mount Prospect to Ostroda | 4,568.44 mi (7,352.19 km) |
| Mount Prospect to Ostroleka | 4,647.07 mi (7,478.74 km) |
| Mount Prospect to Ostrow Mazowiecka | 4,669.62 mi (7,515.02 km) |
| Mount Prospect to Ostrow Wielkopolski | 4,587.84 mi (7,383.42 km) |
| Mount Prospect to Ostrowiec Swietokrzyski | 4,738.26 mi (7,625.50 km) |
| Mount Prospect to Ostrzeszow | 4,601.84 mi (7,405.95 km) |
| Mount Prospect to Oswiecim | 4,705.92 mi (7,573.44 km) |
| Mount Prospect to Otwock | 4,680.32 mi (7,532.25 km) |
| Mount Prospect to Ozarow Mazowiecki | 4,660.81 mi (7,500.85 km) |
| Mount Prospect to Ozimek | 4,643.69 mi (7,473.30 km) |
| Mount Prospect to Ozorkow | 4,622.59 mi (7,439.33 km) |
| Mount Prospect to Pabianice | 4,639.84 mi (7,467.10 km) |
