| Alcazar de San Juan to Olympia Heights (Florida) | 4,456.39 mi (7,171.87 km) |
| Alcazar de San Juan to Omaha (Nebraska) | 4,633.21 mi (7,456.43 km) |
| Alcazar de San Juan to On Top of the World Designated Place (Florida) | 4,429.49 mi (7,128.58 km) |
| Alcazar de San Juan to Onalaska (Wisconsin) | 4,328.37 mi (6,965.84 km) |
| Alcazar de San Juan to Oneida (New York) | 3,652.68 mi (5,878.42 km) |
| Alcazar de San Juan to Oneonta (New York) | 3,641.25 mi (5,860.03 km) |
| Alcazar de San Juan to Ontario (California) | 5,858.33 mi (9,428.06 km) |
| Alcazar de San Juan to Ontario (Oregon) | 5,351.47 mi (8,612.35 km) |
| Alcazar de San Juan to Opa-locka (Florida) | 4,445.37 mi (7,154.13 km) |
| Alcazar de San Juan to Opelika (Alabama) | 4,453.54 mi (7,167.27 km) |
| Alcazar de San Juan to Opelousas (Louisiana) | 4,864.03 mi (7,827.90 km) |
| Alcazar de San Juan to Orange (California) | 5,878.57 mi (9,460.64 km) |
| Alcazar de San Juan to Orange (Texas) | 4,961.86 mi (7,985.35 km) |
| Alcazar de San Juan to Orange City (Florida) | 4,384.90 mi (7,056.81 km) |
| Alcazar de San Juan to Orangeburg (South Carolina) | 4,200.23 mi (6,759.62 km) |
