| Waltham Cross to Oerlinghausen | 371.79 mi (598.34 km) |
| Waltham Cross to Oestrich-Winkel | 369.10 mi (594.00 km) |
| Waltham Cross to Offenburg | 417.09 mi (671.24 km) |
| Waltham Cross to Oftersheim | 410.61 mi (660.81 km) |
| Waltham Cross to Ohrdruf | 468.84 mi (754.53 km) |
| Waltham Cross to Ohringen | 452.85 mi (728.79 km) |
| Waltham Cross to Olbernhau | 582.42 mi (937.31 km) |
| Waltham Cross to Olching | 558.39 mi (898.65 km) |
| Waltham Cross to Oldenburg | 361.62 mi (581.97 km) |
| Waltham Cross to Oldenburg in Holstein | 487.96 mi (785.30 km) |
| Waltham Cross to Olfen | 317.45 mi (510.89 km) |
| Waltham Cross to Olpe | 342.41 mi (551.06 km) |
| Waltham Cross to Olsberg | 366.69 mi (590.12 km) |
| Waltham Cross to Oranienburg | 565.70 mi (910.41 km) |
| Waltham Cross to Ortenberg | 405.26 mi (652.21 km) |
