| Aberystwyth to Oerlinghausen | 540.13 mi (869.26 km) |
| Aberystwyth to Oestrich-Winkel | 548.14 mi (882.15 km) |
| Aberystwyth to Offenburg | 593.87 mi (955.74 km) |
| Aberystwyth to Oftersheim | 589.73 mi (949.08 km) |
| Aberystwyth to Ohrdruf | 643.66 mi (1,035.87 km) |
| Aberystwyth to Ohringen | 632.01 mi (1,017.13 km) |
| Aberystwyth to Olbernhau | 756.12 mi (1,216.85 km) |
| Aberystwyth to Olching | 737.36 mi (1,186.66 km) |
| Aberystwyth to Oldenburg | 515.68 mi (829.90 km) |
| Aberystwyth to Oldenburg in Holstein | 629.41 mi (1,012.93 km) |
| Aberystwyth to Olfen | 488.81 mi (786.67 km) |
| Aberystwyth to Olpe | 518.46 mi (834.37 km) |
| Aberystwyth to Olsberg | 540.18 mi (869.34 km) |
| Aberystwyth to Oranienburg | 725.64 mi (1,167.81 km) |
| Aberystwyth to Ortenberg | 583.11 mi (938.43 km) |
