| Harker Heights to Orbetello | 5,647.16 mi (9,088.23 km) |
| Harker Heights to Oria | 5,993.06 mi (9,644.90 km) |
| Harker Heights to Oristano | 5,633.44 mi (9,066.15 km) |
| Harker Heights to Orta Nova | 5,878.80 mi (9,461.01 km) |
| Harker Heights to Orte | 5,695.12 mi (9,165.41 km) |
| Harker Heights to Ortona | 5,782.39 mi (9,305.86 km) |
| Harker Heights to Orvieto | 5,673.34 mi (9,130.35 km) |
| Harker Heights to Orzinuovi | 5,479.07 mi (8,817.70 km) |
| Harker Heights to Osimo | 5,698.45 mi (9,170.76 km) |
| Harker Heights to Ospitaletto | 5,478.73 mi (8,817.16 km) |
| Harker Heights to Ostuni | 5,980.86 mi (9,625.26 km) |
| Harker Heights to Ottaviano | 5,848.05 mi (9,411.53 km) |
| Harker Heights to Ovada | 5,455.59 mi (8,779.92 km) |
| Harker Heights to Ozieri | 5,625.37 mi (9,053.15 km) |
| Harker Heights to Paceco | 5,883.84 mi (9,469.13 km) |
