| Galveston to Opole | 5,568.66 mi (8,961.88 km) |
| Galveston to Orzesze | 5,618.70 mi (9,042.42 km) |
| Galveston to Osowa | 5,436.86 mi (8,749.78 km) |
| Galveston to Ostroda | 5,515.45 mi (8,876.25 km) |
| Galveston to Ostroleka | 5,594.43 mi (9,003.37 km) |
| Galveston to Ostrow Mazowiecka | 5,616.70 mi (9,039.20 km) |
| Galveston to Ostrow Wielkopolski | 5,525.30 mi (8,892.10 km) |
| Galveston to Ostrowiec Swietokrzyski | 5,679.16 mi (9,139.72 km) |
| Galveston to Ostrzeszow | 5,538.68 mi (8,913.64 km) |
| Galveston to Oswiecim | 5,640.12 mi (9,076.90 km) |
| Galveston to Otwock | 5,624.58 mi (9,051.89 km) |
| Galveston to Ozarow Mazowiecki | 5,604.68 mi (9,019.86 km) |
| Galveston to Ozimek | 5,578.37 mi (8,977.53 km) |
| Galveston to Ozorkow | 5,563.41 mi (8,953.44 km) |
| Galveston to Pabianice | 5,579.79 mi (8,979.81 km) |
