| Ontario to Decatur (Alabama) | 1,741.01 mi (2,801.88 km) |
| Ontario to Decatur (Georgia) | 1,901.69 mi (3,060.47 km) |
| Ontario to Decatur (Illinois) | 1,625.78 mi (2,616.44 km) |
| Ontario to Deer Park (New York) | 2,448.16 mi (3,939.93 km) |
| Ontario to Deer Park (Texas) | 1,350.59 mi (2,173.57 km) |
| Ontario to Deerfield (Illinois) | 1,702.12 mi (2,739.30 km) |
| Ontario to Deerfield Beach (Florida) | 2,288.11 mi (3,682.35 km) |
| Ontario to Defiance (Ohio) | 1,873.14 mi (3,014.53 km) |
| Ontario to DeForest (Wisconsin) | 1,642.24 mi (2,642.93 km) |
| Ontario to DeKalb (Illinois) | 1,654.08 mi (2,661.98 km) |
| Ontario to Del Aire (California) | 44.52 mi (71.65 km) |
| Ontario to Del City (Oklahoma) | 1,147.03 mi (1,845.96 km) |
| Ontario to Del Rio (Texas) | 1,033.29 mi (1,662.92 km) |
| Ontario to DeLand (Florida) | 2,155.41 mi (3,468.80 km) |
| Ontario to Delano (California) | 151.83 mi (244.34 km) |
