| Letchworth to Opole | 787.40 mi (1,267.20 km) |
| Letchworth to Orzesze | 831.31 mi (1,337.87 km) |
| Letchworth to Osowa | 789.71 mi (1,270.92 km) |
| Letchworth to Ostroda | 848.34 mi (1,365.27 km) |
| Letchworth to Ostroleka | 915.85 mi (1,473.91 km) |
| Letchworth to Ostrow Mazowiecka | 931.19 mi (1,498.61 km) |
| Letchworth to Ostrow Wielkopolski | 769.20 mi (1,237.92 km) |
| Letchworth to Ostrowiec Swietokrzyski | 930.58 mi (1,497.62 km) |
| Letchworth to Ostrzeszow | 776.78 mi (1,250.11 km) |
| Letchworth to Oswiecim | 853.54 mi (1,373.64 km) |
| Letchworth to Otwock | 910.16 mi (1,464.77 km) |
| Letchworth to Ozarow Mazowiecki | 889.65 mi (1,431.75 km) |
| Letchworth to Ozimek | 799.20 mi (1,286.19 km) |
| Letchworth to Ozorkow | 828.07 mi (1,332.65 km) |
| Letchworth to Pabianice | 835.54 mi (1,344.67 km) |
