| Seclin to Orzesze | 692.35 mi (1,114.23 km) |
| Seclin to Osowa | 700.93 mi (1,128.04 km) |
| Seclin to Ostroda | 748.68 mi (1,204.88 km) |
| Seclin to Ostroleka | 808.36 mi (1,300.94 km) |
| Seclin to Ostrow Mazowiecka | 820.87 mi (1,321.06 km) |
| Seclin to Ostrow Wielkopolski | 644.96 mi (1,037.97 km) |
| Seclin to Ostrowiec Swietokrzyski | 801.61 mi (1,290.06 km) |
| Seclin to Ostrzeszow | 649.93 mi (1,045.96 km) |
| Seclin to Oswiecim | 714.18 mi (1,149.35 km) |
| Seclin to Otwock | 792.57 mi (1,275.51 km) |
| Seclin to Ozarow Mazowiecki | 772.92 mi (1,243.89 km) |
| Seclin to Ozimek | 664.63 mi (1,069.62 km) |
| Seclin to Ozorkow | 708.10 mi (1,139.57 km) |
| Seclin to Pabianice | 712.13 mi (1,146.07 km) |
| Seclin to Parczew | 861.46 mi (1,386.38 km) |
