| Karlovy Vary to Olympia Heights (Florida) | 5,006.68 mi (8,057.48 km) |
| Karlovy Vary to Omaha (Nebraska) | 4,798.81 mi (7,722.94 km) |
| Karlovy Vary to On Top of the World Designated Place (Florida) | 4,913.78 mi (7,907.97 km) |
| Karlovy Vary to Onalaska (Wisconsin) | 4,499.46 mi (7,241.18 km) |
| Karlovy Vary to Oneida (New York) | 3,974.72 mi (6,396.70 km) |
| Karlovy Vary to Oneonta (New York) | 3,979.88 mi (6,405.00 km) |
| Karlovy Vary to Ontario (California) | 5,877.01 mi (9,458.13 km) |
| Karlovy Vary to Ontario (Oregon) | 5,261.14 mi (8,466.99 km) |
| Karlovy Vary to Opa-locka (Florida) | 4,994.18 mi (8,037.36 km) |
| Karlovy Vary to Opelika (Alabama) | 4,855.42 mi (7,814.05 km) |
| Karlovy Vary to Opelousas (Louisiana) | 5,225.44 mi (8,409.53 km) |
| Karlovy Vary to Orange (California) | 5,897.23 mi (9,490.68 km) |
| Karlovy Vary to Orange (Texas) | 5,310.42 mi (8,546.29 km) |
| Karlovy Vary to Orange City (Florida) | 4,881.80 mi (7,856.49 km) |
| Karlovy Vary to Orangeburg (South Carolina) | 4,635.16 mi (7,459.56 km) |
