| Hartlepool to Olivares | 1,216.00 mi (1,956.96 km) |
| Hartlepool to Olivenza | 1,139.49 mi (1,833.84 km) |
| Hartlepool to Olot | 880.37 mi (1,416.81 km) |
| Hartlepool to Onate | 807.23 mi (1,299.12 km) |
| Hartlepool to Onda | 1,018.51 mi (1,639.14 km) |
| Hartlepool to Onteniente | 1,096.72 mi (1,765.00 km) |
| Hartlepool to Orihuela | 1,147.32 mi (1,846.43 km) |
| Hartlepool to Osuna | 1,220.05 mi (1,963.49 km) |
| Hartlepool to Ourense | 905.25 mi (1,456.87 km) |
| Hartlepool to Oviedo | 810.05 mi (1,303.65 km) |
| Hartlepool to Paiporta | 1,055.16 mi (1,698.11 km) |
| Hartlepool to Pajara | 1,931.15 mi (3,107.88 km) |
| Hartlepool to Palafolls | 917.59 mi (1,476.72 km) |
| Hartlepool to Palafrugell | 904.65 mi (1,455.89 km) |
| Hartlepool to Palamos | 909.16 mi (1,463.16 km) |
