| Didcot to Opole | 831.41 mi (1,338.02 km) |
| Didcot to Orzesze | 874.53 mi (1,407.43 km) |
| Didcot to Osowa | 839.17 mi (1,350.52 km) |
| Didcot to Ostroda | 897.14 mi (1,443.80 km) |
| Didcot to Ostroleka | 964.03 mi (1,551.45 km) |
| Didcot to Ostrow Mazowiecka | 979.10 mi (1,575.71 km) |
| Didcot to Ostrow Wielkopolski | 815.07 mi (1,311.73 km) |
| Didcot to Ostrowiec Swietokrzyski | 975.92 mi (1,570.59 km) |
| Didcot to Ostrzeszow | 822.25 mi (1,323.28 km) |
| Didcot to Oswiecim | 896.70 mi (1,443.10 km) |
| Didcot to Otwock | 957.19 mi (1,540.45 km) |
| Didcot to Ozarow Mazowiecki | 936.76 mi (1,507.57 km) |
| Didcot to Ozimek | 843.30 mi (1,357.16 km) |
| Didcot to Ozorkow | 874.67 mi (1,407.64 km) |
| Didcot to Pabianice | 881.65 mi (1,418.88 km) |
