| Ontario to Dallas (Oregon) | 810.64 mi (1,304.60 km) |
| Ontario to Dallas (Texas) | 1,202.86 mi (1,935.81 km) |
| Ontario to Dalton (Georgia) | 1,852.85 mi (2,981.87 km) |
| Ontario to Daly City (California) | 370.86 mi (596.83 km) |
| Ontario to Damascus (Maryland) | 2,250.03 mi (3,621.08 km) |
| Ontario to Damascus (Oregon) | 827.07 mi (1,331.05 km) |
| Ontario to Dana Point (California) | 39.45 mi (63.49 km) |
| Ontario to Danbury (Connecticut) | 2,437.99 mi (3,923.56 km) |
| Ontario to Dania Beach (Florida) | 2,292.63 mi (3,689.64 km) |
| Ontario to Danville (California) | 357.05 mi (574.62 km) |
| Ontario to Danville (Illinois) | 1,697.27 mi (2,731.50 km) |
| Ontario to Danville (Indiana) | 1,754.05 mi (2,822.87 km) |
| Ontario to Danville (Kentucky) | 1,846.03 mi (2,970.89 km) |
| Ontario to Danville (Virginia) | 2,146.71 mi (3,454.79 km) |
| Ontario to Daphne (Alabama) | 1,745.12 mi (2,808.51 km) |
