| Welwyn Garden City to Nuth | 269.17 mi (433.19 km) |
| Welwyn Garden City to Oegstgeest | 199.92 mi (321.73 km) |
| Welwyn Garden City to Oirschot | 236.37 mi (380.40 km) |
| Welwyn Garden City to Oisterwijk | 231.44 mi (372.46 km) |
| Welwyn Garden City to Oldebroek | 262.17 mi (421.92 km) |
| Welwyn Garden City to Oldenzaal | 304.65 mi (490.29 km) |
| Welwyn Garden City to Ommen | 284.32 mi (457.57 km) |
| Welwyn Garden City to Oosterend | 276.42 mi (444.85 km) |
| Welwyn Garden City to Oosterhout | 216.39 mi (348.25 km) |
| Welwyn Garden City to Oosterwolde | 285.25 mi (459.06 km) |
| Welwyn Garden City to Oostzaan | 219.63 mi (353.46 km) |
| Welwyn Garden City to Opmeer | 226.08 mi (363.84 km) |
| Welwyn Garden City to Oss | 244.00 mi (392.68 km) |
| Welwyn Garden City to Oud-Beijerland | 196.18 mi (315.72 km) |
| Welwyn Garden City to Oudenbosch | 202.53 mi (325.94 km) |
