| Ontario to Dixon (California) | 384.61 mi (618.97 km) |
| Ontario to Dixon (Illinois) | 1,615.99 mi (2,600.68 km) |
| Ontario to Dobbs Ferry (New York) | 2,418.59 mi (3,892.35 km) |
| Ontario to Doctor Phillips (Florida) | 2,156.73 mi (3,470.92 km) |
| Ontario to Dodge City (Kansas) | 1,015.69 mi (1,634.60 km) |
| Ontario to Dolton (Illinois) | 1,709.41 mi (2,751.03 km) |
| Ontario to Donna (Texas) | 1,286.71 mi (2,070.75 km) |
| Ontario to Dorado (Puerto Rico) | 3,320.53 mi (5,343.88 km) |
| Ontario to Doral (Florida) | 2,288.26 mi (3,682.60 km) |
| Ontario to Doraville (Georgia) | 1,901.50 mi (3,060.16 km) |
| Ontario to Dothan (Alabama) | 1,875.79 mi (3,018.79 km) |
| Ontario to Douglas (Arizona) | 504.05 mi (811.19 km) |
| Ontario to Douglas (Georgia) | 2,016.86 mi (3,245.83 km) |
| Ontario to Douglasville (Georgia) | 1,878.94 mi (3,023.86 km) |
| Ontario to Dover (Delaware) | 2,340.03 mi (3,765.92 km) |
