| Didcot to Oerlinghausen | 423.87 mi (682.15 km) |
| Didcot to Oestrich-Winkel | 418.17 mi (672.99 km) |
| Didcot to Offenburg | 460.85 mi (741.67 km) |
| Didcot to Oftersheim | 458.28 mi (737.53 km) |
| Didcot to Ohrdruf | 520.39 mi (837.49 km) |
| Didcot to Ohringen | 500.82 mi (805.99 km) |
| Didcot to Olbernhau | 634.11 mi (1,020.50 km) |
| Didcot to Olching | 605.37 mi (974.25 km) |
| Didcot to Oldenburg | 412.38 mi (663.67 km) |
| Didcot to Oldenburg in Holstein | 537.09 mi (864.36 km) |
| Didcot to Olfen | 369.49 mi (594.64 km) |
| Didcot to Olpe | 393.76 mi (633.70 km) |
| Didcot to Olsberg | 418.52 mi (673.55 km) |
| Didcot to Oranienburg | 617.42 mi (993.64 km) |
| Didcot to Ortenberg | 455.73 mi (733.43 km) |
