| Harker Heights to Olivares | 5,029.97 mi (8,094.95 km) |
| Harker Heights to Olivenza | 4,945.15 mi (7,958.45 km) |
| Harker Heights to Olot | 5,280.41 mi (8,497.99 km) |
| Harker Heights to Onate | 5,032.92 mi (8,099.70 km) |
| Harker Heights to Onda | 5,230.34 mi (8,417.42 km) |
| Harker Heights to Onteniente | 5,252.21 mi (8,452.62 km) |
| Harker Heights to Orihuela | 5,260.63 mi (8,466.17 km) |
| Harker Heights to Osuna | 5,087.23 mi (8,187.10 km) |
| Harker Heights to Ourense | 4,803.44 mi (7,730.39 km) |
| Harker Heights to Oviedo | 4,867.57 mi (7,833.59 km) |
| Harker Heights to Paiporta | 5,240.93 mi (8,434.46 km) |
| Harker Heights to Pajara | 4,888.16 mi (7,866.73 km) |
| Harker Heights to Palafolls | 5,309.76 mi (8,545.23 km) |
| Harker Heights to Palafrugell | 5,319.51 mi (8,560.92 km) |
| Harker Heights to Palamos | 5,320.48 mi (8,562.49 km) |
