| Didcot to Oberkirch | 464.36 mi (747.31 km) |
| Didcot to Obernburg am Main | 469.79 mi (756.05 km) |
| Didcot to Obernkirchen | 443.24 mi (713.32 km) |
| Didcot to Oberschleissheim | 614.01 mi (988.16 km) |
| Didcot to Oberstdorf | 591.67 mi (952.20 km) |
| Didcot to Obertraubling | 618.37 mi (995.16 km) |
| Didcot to Obertshausen | 451.87 mi (727.22 km) |
| Didcot to Oberursel | 438.25 mi (705.30 km) |
| Didcot to Ochsenfurt | 513.12 mi (825.78 km) |
| Didcot to Ochsenhausen | 554.38 mi (892.19 km) |
| Didcot to Ochtrup | 361.58 mi (581.90 km) |
| Didcot to Odenthal | 362.86 mi (583.97 km) |
| Didcot to Oelde | 402.00 mi (646.96 km) |
| Didcot to Oelsnitz | 587.76 mi (945.90 km) |
| Didcot to Oer-Erkenschwick | 364.05 mi (585.89 km) |
