| Seini to Opole | 314.57 mi (506.25 km) |
| Seini to Orzesze | 264.30 mi (425.35 km) |
| Seini to Osowa | 506.31 mi (814.83 km) |
| Seini to Ostroda | 436.00 mi (701.67 km) |
| Seini to Ostroleka | 375.18 mi (603.80 km) |
| Seini to Ostrow Mazowiecka | 354.37 mi (570.31 km) |
| Seini to Ostrow Wielkopolski | 363.67 mi (585.28 km) |
| Seini to Ostrowiec Swietokrzyski | 235.87 mi (379.60 km) |
| Seini to Ostrzeszow | 348.74 mi (561.24 km) |
| Seini to Oswiecim | 243.09 mi (391.21 km) |
| Seini to Otwock | 314.90 mi (506.78 km) |
| Seini to Ozarow Mazowiecki | 327.87 mi (527.65 km) |
| Seini to Ozimek | 305.27 mi (491.29 km) |
| Seini to Ozorkow | 341.57 mi (549.70 km) |
| Seini to Pabianice | 320.99 mi (516.58 km) |
