| Waltham Cross to Oberkirch | 420.11 mi (676.11 km) |
| Waltham Cross to Obernburg am Main | 420.42 mi (676.60 km) |
| Waltham Cross to Obernkirchen | 391.26 mi (629.68 km) |
| Waltham Cross to Oberschleissheim | 566.72 mi (912.04 km) |
| Waltham Cross to Oberstdorf | 547.87 mi (881.72 km) |
| Waltham Cross to Obertraubling | 569.20 mi (916.04 km) |
| Waltham Cross to Obertshausen | 402.13 mi (647.16 km) |
| Waltham Cross to Oberursel | 388.31 mi (624.93 km) |
| Waltham Cross to Ochsenfurt | 463.68 mi (746.22 km) |
| Waltham Cross to Ochsenhausen | 509.12 mi (819.35 km) |
| Waltham Cross to Ochtrup | 309.60 mi (498.25 km) |
| Waltham Cross to Odenthal | 311.62 mi (501.50 km) |
| Waltham Cross to Oelde | 349.92 mi (563.15 km) |
| Waltham Cross to Oelsnitz | 536.43 mi (863.31 km) |
| Waltham Cross to Oer-Erkenschwick | 312.05 mi (502.19 km) |
