| Llantrisant to Nuth | 402.62 mi (647.96 km) |
| Llantrisant to Oegstgeest | 337.34 mi (542.90 km) |
| Llantrisant to Oirschot | 372.75 mi (599.88 km) |
| Llantrisant to Oisterwijk | 368.12 mi (592.43 km) |
| Llantrisant to Oldebroek | 399.24 mi (642.52 km) |
| Llantrisant to Oldenzaal | 442.05 mi (711.41 km) |
| Llantrisant to Ommen | 421.32 mi (678.05 km) |
| Llantrisant to Oosterend | 411.41 mi (662.09 km) |
| Llantrisant to Oosterhout | 353.23 mi (568.47 km) |
| Llantrisant to Oosterwolde | 420.45 mi (676.65 km) |
| Llantrisant to Oostzaan | 356.54 mi (573.79 km) |
| Llantrisant to Opmeer | 361.90 mi (582.42 km) |
| Llantrisant to Oss | 381.23 mi (613.53 km) |
| Llantrisant to Oud-Beijerland | 333.48 mi (536.68 km) |
| Llantrisant to Oudenbosch | 339.11 mi (545.74 km) |
