| Halstead to Olivares | 1,056.66 mi (1,700.53 km) |
| Halstead to Olivenza | 988.99 mi (1,591.62 km) |
| Halstead to Olot | 680.07 mi (1,094.47 km) |
| Halstead to Onate | 631.93 mi (1,016.99 km) |
| Halstead to Onda | 829.04 mi (1,334.21 km) |
| Halstead to Onteniente | 908.69 mi (1,462.39 km) |
| Halstead to Orihuela | 960.67 mi (1,546.05 km) |
| Halstead to Osuna | 1,054.18 mi (1,696.54 km) |
| Halstead to Ourense | 773.74 mi (1,245.21 km) |
| Halstead to Oviedo | 664.94 mi (1,070.12 km) |
| Halstead to Paiporta | 866.35 mi (1,394.25 km) |
| Halstead to Pajara | 1,798.71 mi (2,894.74 km) |
| Halstead to Palafolls | 716.89 mi (1,153.72 km) |
| Halstead to Palafrugell | 702.88 mi (1,131.17 km) |
| Halstead to Palamos | 707.50 mi (1,138.61 km) |
