| Llantwit Major to Oerlinghausen | 520.92 mi (838.35 km) |
| Llantwit Major to Oestrich-Winkel | 510.89 mi (822.20 km) |
| Llantwit Major to Offenburg | 545.75 mi (878.31 km) |
| Llantwit Major to Oftersheim | 548.85 mi (883.29 km) |
| Llantwit Major to Ohrdruf | 616.54 mi (992.23 km) |
| Llantwit Major to Ohringen | 591.67 mi (952.20 km) |
| Llantwit Major to Olbernhau | 730.45 mi (1,175.55 km) |
| Llantwit Major to Olching | 694.39 mi (1,117.51 km) |
| Llantwit Major to Oldenburg | 507.91 mi (817.40 km) |
| Llantwit Major to Oldenburg in Holstein | 630.23 mi (1,014.26 km) |
| Llantwit Major to Olfen | 466.46 mi (750.70 km) |
| Llantwit Major to Olpe | 489.71 mi (788.12 km) |
| Llantwit Major to Olsberg | 515.16 mi (829.07 km) |
| Llantwit Major to Oranienburg | 714.05 mi (1,149.16 km) |
| Llantwit Major to Ortenberg | 550.34 mi (885.69 km) |
