| Ontario to Des Plaines (Illinois) | 1,698.18 mi (2,732.95 km) |
| Ontario to Desert Hot Springs (California) | 61.20 mi (98.49 km) |
| Ontario to DeSoto (Texas) | 1,199.69 mi (1,930.72 km) |
| Ontario to Destin (Florida) | 1,830.31 mi (2,945.60 km) |
| Ontario to Destrehan (Louisiana) | 1,615.74 mi (2,600.29 km) |
| Ontario to Detroit (Michigan) | 1,944.77 mi (3,129.80 km) |
| Ontario to Diamond Bar (California) | 12.32 mi (19.83 km) |
| Ontario to Diamond Springs (California) | 368.30 mi (592.72 km) |
| Ontario to Dickinson (North Dakota) | 1,177.04 mi (1,894.26 km) |
| Ontario to Dickinson (Texas) | 1,359.06 mi (2,187.20 km) |
| Ontario to Dickson (Tennessee) | 1,709.28 mi (2,750.83 km) |
| Ontario to Difficult Run (Virginia) | 2,243.65 mi (3,610.80 km) |
| Ontario to Dinuba (California) | 200.48 mi (322.64 km) |
| Ontario to Discovery Bay (California) | 348.10 mi (560.21 km) |
| Ontario to Dix Hills (New York) | 2,447.16 mi (3,938.32 km) |
