| Boston to Opole | 781.02 mi (1,256.92 km) |
| Boston to Orzesze | 826.95 mi (1,330.84 km) |
| Boston to Osowa | 760.78 mi (1,224.36 km) |
| Boston to Ostroda | 823.43 mi (1,325.18 km) |
| Boston to Ostroleka | 893.86 mi (1,438.53 km) |
| Boston to Ostrow Mazowiecka | 910.42 mi (1,465.19 km) |
| Boston to Ostrow Wielkopolski | 757.03 mi (1,218.32 km) |
| Boston to Ostrowiec Swietokrzyski | 919.45 mi (1,479.71 km) |
| Boston to Ostrzeszow | 765.93 mi (1,232.64 km) |
| Boston to Oswiecim | 849.23 mi (1,366.70 km) |
| Boston to Otwock | 893.14 mi (1,437.37 km) |
| Boston to Ozarow Mazowiecki | 872.36 mi (1,403.93 km) |
| Boston to Ozimek | 792.48 mi (1,275.37 km) |
| Boston to Ozorkow | 813.02 mi (1,308.44 km) |
| Boston to Pabianice | 822.21 mi (1,323.21 km) |
