| Sitges to Olympia Heights (Florida) | 4,680.84 mi (7,533.08 km) |
| Sitges to Omaha (Nebraska) | 4,771.41 mi (7,678.85 km) |
| Sitges to On Top of the World Designated Place (Florida) | 4,639.85 mi (7,467.12 km) |
| Sitges to Onalaska (Wisconsin) | 4,465.45 mi (7,186.45 km) |
| Sitges to Oneida (New York) | 3,820.37 mi (6,148.29 km) |
| Sitges to Oneonta (New York) | 3,812.78 mi (6,136.07 km) |
| Sitges to Ontario (California) | 5,969.06 mi (9,606.28 km) |
| Sitges to Ontario (Oregon) | 5,430.34 mi (8,739.29 km) |
| Sitges to Opa-locka (Florida) | 4,669.45 mi (7,514.75 km) |
| Sitges to Opelika (Alabama) | 4,645.92 mi (7,476.89 km) |
| Sitges to Opelousas (Louisiana) | 5,049.96 mi (8,127.13 km) |
| Sitges to Orange (California) | 5,989.44 mi (9,639.08 km) |
| Sitges to Orange (Texas) | 5,145.51 mi (8,280.90 km) |
| Sitges to Orange City (Florida) | 4,597.70 mi (7,399.29 km) |
| Sitges to Orangeburg (South Carolina) | 4,398.32 mi (7,078.42 km) |
