| South Houston to Opole | 5,557.67 mi (8,944.20 km) |
| South Houston to Orzesze | 5,607.77 mi (9,024.84 km) |
| South Houston to Osowa | 5,423.97 mi (8,729.04 km) |
| South Houston to Ostroda | 5,502.60 mi (8,855.58 km) |
| South Houston to Ostroleka | 5,581.54 mi (8,982.62 km) |
| South Houston to Ostrow Mazowiecka | 5,603.86 mi (9,018.54 km) |
| South Houston to Ostrow Wielkopolski | 5,513.86 mi (8,873.70 km) |
| South Houston to Ostrowiec Swietokrzyski | 5,667.28 mi (9,120.60 km) |
| South Houston to Ostrzeszow | 5,527.33 mi (8,895.38 km) |
| South Houston to Oswiecim | 5,629.14 mi (9,059.23 km) |
| South Houston to Otwock | 5,612.19 mi (9,031.95 km) |
| South Houston to Ozarow Mazowiecki | 5,592.34 mi (9,000.00 km) |
| South Houston to Ozimek | 5,567.32 mi (8,959.74 km) |
| South Houston to Ozorkow | 5,551.51 mi (8,934.29 km) |
| South Houston to Pabianice | 5,568.02 mi (8,960.87 km) |
