| Slough to Opole | 803.76 mi (1,293.53 km) |
| Slough to Orzesze | 846.64 mi (1,362.54 km) |
| Slough to Osowa | 815.54 mi (1,312.48 km) |
| Slough to Ostroda | 872.50 mi (1,404.15 km) |
| Slough to Ostroleka | 938.71 mi (1,510.71 km) |
| Slough to Ostrow Mazowiecka | 953.53 mi (1,534.56 km) |
| Slough to Ostrow Wielkopolski | 788.20 mi (1,268.49 km) |
| Slough to Ostrowiec Swietokrzyski | 948.77 mi (1,526.90 km) |
| Slough to Ostrzeszow | 795.18 mi (1,279.72 km) |
| Slough to Oswiecim | 868.79 mi (1,398.18 km) |
| Slough to Otwock | 930.96 mi (1,498.24 km) |
| Slough to Ozarow Mazowiecki | 910.59 mi (1,465.45 km) |
| Slough to Ozimek | 815.69 mi (1,312.73 km) |
| Slough to Ozorkow | 848.18 mi (1,365.01 km) |
| Slough to Pabianice | 854.89 mi (1,375.81 km) |
