| Altus to Olympia Heights (Florida) | 1,286.78 mi (2,070.87 km) |
| Altus to Omaha (Nebraska) | 489.54 mi (787.84 km) |
| Altus to On Top of the World Designated Place (Florida) | 1,067.90 mi (1,718.63 km) |
| Altus to Onalaska (Wisconsin) | 770.17 mi (1,239.46 km) |
| Altus to Oneida (New York) | 1,392.35 mi (2,240.78 km) |
| Altus to Oneonta (New York) | 1,409.92 mi (2,269.05 km) |
| Altus to Ontario (California) | 1,043.38 mi (1,679.16 km) |
| Altus to Ontario (Oregon) | 1,140.94 mi (1,836.17 km) |
| Altus to Opa-locka (Florida) | 1,284.56 mi (2,067.30 km) |
| Altus to Opelika (Alabama) | 812.15 mi (1,307.03 km) |
| Altus to Opelousas (Louisiana) | 508.05 mi (817.63 km) |
| Altus to Orange (California) | 1,057.87 mi (1,702.47 km) |
| Altus to Orange (Texas) | 450.19 mi (724.51 km) |
| Altus to Orange City (Florida) | 1,127.51 mi (1,814.55 km) |
| Altus to Orangeburg (South Carolina) | 1,056.85 mi (1,700.84 km) |
