| Conwy to Opole | 939.88 mi (1,512.59 km) |
| Conwy to Orzesze | 986.05 mi (1,586.89 km) |
| Conwy to Osowa | 908.47 mi (1,462.04 km) |
| Conwy to Ostroda | 974.09 mi (1,567.64 km) |
| Conwy to Ostroleka | 1,046.34 mi (1,683.92 km) |
| Conwy to Ostrow Mazowiecka | 1,063.63 mi (1,711.74 km) |
| Conwy to Ostrow Wielkopolski | 914.56 mi (1,471.85 km) |
| Conwy to Ostrowiec Swietokrzyski | 1,077.09 mi (1,733.40 km) |
| Conwy to Ostrzeszow | 923.84 mi (1,486.78 km) |
| Conwy to Oswiecim | 1,008.32 mi (1,622.74 km) |
| Conwy to Otwock | 1,048.46 mi (1,687.34 km) |
| Conwy to Ozarow Mazowiecki | 1,027.60 mi (1,653.75 km) |
| Conwy to Ozimek | 951.29 mi (1,530.95 km) |
| Conwy to Ozorkow | 969.40 mi (1,560.10 km) |
| Conwy to Pabianice | 979.23 mi (1,575.93 km) |
