| Western Springs to Opole | 4,646.79 mi (7,478.29 km) |
| Western Springs to Orzesze | 4,697.23 mi (7,559.46 km) |
| Western Springs to Osowa | 4,502.78 mi (7,246.52 km) |
| Western Springs to Ostroda | 4,581.53 mi (7,373.25 km) |
| Western Springs to Ostroleka | 4,660.19 mi (7,499.84 km) |
| Western Springs to Ostrow Mazowiecka | 4,682.72 mi (7,536.10 km) |
| Western Springs to Ostrow Wielkopolski | 4,600.34 mi (7,403.52 km) |
| Western Springs to Ostrowiec Swietokrzyski | 4,750.98 mi (7,645.96 km) |
| Western Springs to Ostrzeszow | 4,614.30 mi (7,425.99 km) |
| Western Springs to Oswiecim | 4,718.24 mi (7,593.27 km) |
| Western Springs to Otwock | 4,693.24 mi (7,553.04 km) |
| Western Springs to Ozarow Mazowiecki | 4,673.70 mi (7,521.59 km) |
| Western Springs to Ozimek | 4,656.03 mi (7,493.15 km) |
| Western Springs to Ozorkow | 4,635.28 mi (7,459.76 km) |
| Western Springs to Pabianice | 4,652.48 mi (7,487.45 km) |
