| Pittsburgh to Opole | 4,435.37 mi (7,138.04 km) |
| Pittsburgh to Orzesze | 4,485.06 mi (7,218.00 km) |
| Pittsburgh to Osowa | 4,314.73 mi (6,943.88 km) |
| Pittsburgh to Ostroda | 4,392.88 mi (7,069.66 km) |
| Pittsburgh to Ostroleka | 4,472.02 mi (7,197.01 km) |
| Pittsburgh to Ostrow Mazowiecka | 4,493.91 mi (7,232.24 km) |
| Pittsburgh to Ostrow Wielkopolski | 4,394.23 mi (7,071.84 km) |
| Pittsburgh to Ostrowiec Swietokrzyski | 4,550.32 mi (7,323.04 km) |
| Pittsburgh to Ostrzeszow | 4,407.16 mi (7,092.63 km) |
| Pittsburgh to Oswiecim | 4,506.70 mi (7,252.84 km) |
| Pittsburgh to Otwock | 4,498.86 mi (7,240.21 km) |
| Pittsburgh to Ozarow Mazowiecki | 4,478.64 mi (7,207.67 km) |
| Pittsburgh to Ozimek | 4,445.38 mi (7,154.14 km) |
| Pittsburgh to Ozorkow | 4,434.80 mi (7,137.12 km) |
| Pittsburgh to Pabianice | 4,450.45 mi (7,162.31 km) |
