| Middlesbrough to Olivares | 1,208.14 mi (1,944.32 km) |
| Middlesbrough to Olivenza | 1,131.70 mi (1,821.29 km) |
| Middlesbrough to Olot | 872.95 mi (1,404.88 km) |
| Middlesbrough to Onate | 799.35 mi (1,286.43 km) |
| Middlesbrough to Onda | 1,010.75 mi (1,626.64 km) |
| Middlesbrough to Onteniente | 1,088.93 mi (1,752.46 km) |
| Middlesbrough to Orihuela | 1,139.51 mi (1,833.86 km) |
| Middlesbrough to Osuna | 1,212.17 mi (1,950.80 km) |
| Middlesbrough to Ourense | 897.62 mi (1,444.58 km) |
| Middlesbrough to Oviedo | 802.26 mi (1,291.12 km) |
| Middlesbrough to Paiporta | 1,047.38 mi (1,685.59 km) |
| Middlesbrough to Pajara | 1,923.61 mi (3,095.75 km) |
| Middlesbrough to Palafolls | 910.20 mi (1,464.82 km) |
| Middlesbrough to Palafrugell | 897.33 mi (1,444.12 km) |
| Middlesbrough to Palamos | 901.84 mi (1,451.36 km) |
