| Diamond Bar to Olivares | 5,835.14 mi (9,390.75 km) |
| Diamond Bar to Olivenza | 5,739.78 mi (9,237.29 km) |
| Diamond Bar to Olot | 5,958.96 mi (9,590.01 km) |
| Diamond Bar to Onate | 5,735.54 mi (9,230.45 km) |
| Diamond Bar to Onda | 5,959.98 mi (9,591.67 km) |
| Diamond Bar to Onteniente | 5,999.67 mi (9,655.54 km) |
| Diamond Bar to Orihuela | 6,020.34 mi (9,688.81 km) |
| Diamond Bar to Osuna | 5,887.68 mi (9,475.30 km) |
| Diamond Bar to Ourense | 5,552.28 mi (8,935.53 km) |
| Diamond Bar to Oviedo | 5,588.65 mi (8,994.07 km) |
| Diamond Bar to Paiporta | 5,978.90 mi (9,622.12 km) |
| Diamond Bar to Pajara | 5,851.56 mi (9,417.18 km) |
| Diamond Bar to Palafolls | 5,993.32 mi (9,645.32 km) |
| Diamond Bar to Palafrugell | 5,996.47 mi (9,650.38 km) |
| Diamond Bar to Palamos | 5,998.69 mi (9,653.96 km) |
