| Galveston to Olivares | 4,961.89 mi (7,985.39 km) |
| Galveston to Olivenza | 4,880.11 mi (7,853.78 km) |
| Galveston to Olot | 5,238.38 mi (8,430.35 km) |
| Galveston to Onate | 4,987.71 mi (8,026.95 km) |
| Galveston to Onda | 5,177.70 mi (8,332.70 km) |
| Galveston to Onteniente | 5,195.50 mi (8,361.34 km) |
| Galveston to Orihuela | 5,201.14 mi (8,370.43 km) |
| Galveston to Osuna | 5,019.82 mi (8,078.62 km) |
| Galveston to Ourense | 4,749.90 mi (7,644.22 km) |
| Galveston to Oviedo | 4,819.67 mi (7,756.51 km) |
| Galveston to Paiporta | 5,186.38 mi (8,346.67 km) |
| Galveston to Pajara | 4,782.15 mi (7,696.13 km) |
| Galveston to Palafolls | 5,266.43 mi (8,475.49 km) |
| Galveston to Palafrugell | 5,277.50 mi (8,493.31 km) |
| Galveston to Palamos | 5,278.20 mi (8,494.44 km) |
