| Waltham Cross to Olivares | 1,029.98 mi (1,657.59 km) |
| Waltham Cross to Olivenza | 960.80 mi (1,546.26 km) |
| Waltham Cross to Olot | 667.23 mi (1,073.81 km) |
| Waltham Cross to Onate | 608.07 mi (978.60 km) |
| Waltham Cross to Onda | 810.09 mi (1,303.71 km) |
| Waltham Cross to Onteniente | 889.23 mi (1,431.08 km) |
| Waltham Cross to Orihuela | 940.74 mi (1,513.98 km) |
| Waltham Cross to Osuna | 1,028.73 mi (1,655.59 km) |
| Waltham Cross to Ourense | 742.92 mi (1,195.62 km) |
| Waltham Cross to Oviedo | 635.49 mi (1,022.72 km) |
| Waltham Cross to Paiporta | 847.16 mi (1,363.37 km) |
| Waltham Cross to Pajara | 1,768.76 mi (2,846.54 km) |
| Waltham Cross to Palafolls | 704.42 mi (1,133.66 km) |
| Waltham Cross to Palafrugell | 691.49 mi (1,112.84 km) |
| Waltham Cross to Palamos | 695.99 mi (1,120.09 km) |
