| Llantwit Major to Oberkirch | 549.93 mi (885.03 km) |
| Llantwit Major to Obernburg am Main | 562.77 mi (905.69 km) |
| Llantwit Major to Obernkirchen | 540.21 mi (869.38 km) |
| Llantwit Major to Oberschleissheim | 703.51 mi (1,132.18 km) |
| Llantwit Major to Oberstdorf | 675.83 mi (1,087.65 km) |
| Llantwit Major to Obertraubling | 710.74 mi (1,143.83 km) |
| Llantwit Major to Obertshausen | 545.44 mi (877.80 km) |
| Llantwit Major to Oberursel | 532.13 mi (856.39 km) |
| Llantwit Major to Ochsenfurt | 606.10 mi (975.43 km) |
| Llantwit Major to Ochsenhausen | 640.97 mi (1,031.53 km) |
| Llantwit Major to Ochtrup | 458.56 mi (737.97 km) |
| Llantwit Major to Odenthal | 458.68 mi (738.18 km) |
| Llantwit Major to Oelde | 499.04 mi (803.12 km) |
| Llantwit Major to Oelsnitz | 683.53 mi (1,100.03 km) |
| Llantwit Major to Oer-Erkenschwick | 460.96 mi (741.85 km) |
