| Llantrisant to Oberkirch | 548.60 mi (882.88 km) |
| Llantrisant to Obernburg am Main | 559.59 mi (900.57 km) |
| Llantrisant to Obernkirchen | 534.23 mi (859.76 km) |
| Llantrisant to Oberschleissheim | 701.35 mi (1,128.72 km) |
| Llantrisant to Oberstdorf | 674.85 mi (1,086.07 km) |
| Llantrisant to Obertraubling | 707.79 mi (1,139.08 km) |
| Llantrisant to Obertshausen | 542.06 mi (872.36 km) |
| Llantrisant to Oberursel | 528.64 mi (850.76 km) |
| Llantrisant to Ochsenfurt | 602.93 mi (970.32 km) |
| Llantrisant to Ochsenhausen | 639.47 mi (1,029.12 km) |
| Llantrisant to Ochtrup | 452.61 mi (728.41 km) |
| Llantrisant to Odenthal | 454.33 mi (731.18 km) |
| Llantrisant to Oelde | 493.56 mi (794.31 km) |
| Llantrisant to Oelsnitz | 679.23 mi (1,093.12 km) |
| Llantrisant to Oer-Erkenschwick | 455.76 mi (733.47 km) |
