| Webster Groves to Opole | 4,899.85 mi (7,885.54 km) |
| Webster Groves to Orzesze | 4,950.22 mi (7,966.62 km) |
| Webster Groves to Osowa | 4,758.10 mi (7,657.42 km) |
| Webster Groves to Ostroda | 4,836.83 mi (7,784.13 km) |
| Webster Groves to Ostroleka | 4,915.56 mi (7,910.83 km) |
| Webster Groves to Ostrow Mazowiecka | 4,938.05 mi (7,947.03 km) |
| Webster Groves to Ostrow Wielkopolski | 4,853.99 mi (7,811.74 km) |
| Webster Groves to Ostrowiec Swietokrzyski | 5,005.28 mi (8,055.22 km) |
| Webster Groves to Ostrzeszow | 4,867.84 mi (7,834.04 km) |
| Webster Groves to Oswiecim | 4,971.32 mi (8,000.57 km) |
| Webster Groves to Otwock | 4,948.11 mi (7,963.22 km) |
| Webster Groves to Ozarow Mazowiecki | 4,928.50 mi (7,931.66 km) |
| Webster Groves to Ozimek | 4,909.19 mi (7,900.57 km) |
| Webster Groves to Ozorkow | 4,889.55 mi (7,868.97 km) |
| Webster Groves to Pabianice | 4,906.60 mi (7,896.41 km) |
