| Seaham to Opole | 852.70 mi (1,372.28 km) |
| Seaham to Orzesze | 901.21 mi (1,450.36 km) |
| Seaham to Osowa | 790.13 mi (1,271.60 km) |
| Seaham to Ostroda | 859.93 mi (1,383.92 km) |
| Seaham to Ostroleka | 935.07 mi (1,504.85 km) |
| Seaham to Ostrow Mazowiecka | 953.79 mi (1,534.98 km) |
| Seaham to Ostrow Wielkopolski | 819.22 mi (1,318.40 km) |
| Seaham to Ostrowiec Swietokrzyski | 980.79 mi (1,578.44 km) |
| Seaham to Ostrzeszow | 830.26 mi (1,336.17 km) |
| Seaham to Oswiecim | 923.24 mi (1,485.81 km) |
| Seaham to Otwock | 944.04 mi (1,519.28 km) |
| Seaham to Ozarow Mazowiecki | 923.09 mi (1,485.57 km) |
| Seaham to Ozimek | 863.40 mi (1,389.51 km) |
| Seaham to Ozorkow | 868.95 mi (1,398.45 km) |
| Seaham to Pabianice | 881.10 mi (1,418.00 km) |
