| Welwyn Garden City to Opole | 786.04 mi (1,265.00 km) |
| Welwyn Garden City to Orzesze | 829.57 mi (1,335.07 km) |
| Welwyn Garden City to Osowa | 792.33 mi (1,275.12 km) |
| Welwyn Garden City to Ostroda | 850.19 mi (1,368.25 km) |
| Welwyn Garden City to Ostroleka | 917.13 mi (1,475.98 km) |
| Welwyn Garden City to Ostrow Mazowiecka | 932.25 mi (1,500.31 km) |
| Welwyn Garden City to Ostrow Wielkopolski | 768.86 mi (1,237.36 km) |
| Welwyn Garden City to Ostrowiec Swietokrzyski | 929.94 mi (1,496.59 km) |
| Welwyn Garden City to Ostrzeszow | 776.20 mi (1,249.17 km) |
| Welwyn Garden City to Oswiecim | 851.77 mi (1,370.79 km) |
| Welwyn Garden City to Otwock | 910.57 mi (1,465.42 km) |
| Welwyn Garden City to Ozarow Mazowiecki | 890.11 mi (1,432.49 km) |
| Welwyn Garden City to Ozimek | 797.89 mi (1,284.07 km) |
| Welwyn Garden City to Ozorkow | 828.18 mi (1,332.83 km) |
| Welwyn Garden City to Pabianice | 835.34 mi (1,344.35 km) |
