| Seia to Opole | 1,417.70 mi (2,281.56 km) |
| Seia to Orzesze | 1,440.23 mi (2,317.82 km) |
| Seia to Osowa | 1,544.38 mi (2,485.45 km) |
| Seia to Ostroda | 1,576.71 mi (2,537.47 km) |
| Seia to Ostroleka | 1,620.86 mi (2,608.52 km) |
| Seia to Ostrow Mazowiecka | 1,627.49 mi (2,619.20 km) |
| Seia to Ostrow Wielkopolski | 1,437.64 mi (2,313.66 km) |
| Seia to Ostrowiec Swietokrzyski | 1,567.30 mi (2,522.32 km) |
| Seia to Ostrzeszow | 1,436.21 mi (2,311.36 km) |
| Seia to Oswiecim | 1,457.90 mi (2,346.27 km) |
| Seia to Otwock | 1,586.64 mi (2,553.45 km) |
| Seia to Ozarow Mazowiecki | 1,570.30 mi (2,527.16 km) |
| Seia to Ozimek | 1,429.37 mi (2,300.35 km) |
| Seia to Ozorkow | 1,503.96 mi (2,420.39 km) |
| Seia to Pabianice | 1,500.15 mi (2,414.26 km) |
