| Ontario to Delaware (Ohio) | 1,936.80 mi (3,116.98 km) |
| Ontario to Delhi (California) | 294.07 mi (473.26 km) |
| Ontario to Delray Beach (Florida) | 2,286.26 mi (3,679.38 km) |
| Ontario to Deltona (Florida) | 2,162.24 mi (3,479.80 km) |
| Ontario to Deming (New Mexico) | 582.82 mi (937.96 km) |
| Ontario to Denison (Texas) | 1,203.76 mi (1,937.26 km) |
| Ontario to Dent (Ohio) | 1,850.91 mi (2,978.76 km) |
| Ontario to Denton (Texas) | 1,176.75 mi (1,893.79 km) |
| Ontario to Dentsville (South Carolina) | 2,086.50 mi (3,357.90 km) |
| Ontario to Denver (Colorado) | 805.77 mi (1,296.76 km) |
| Ontario to Depew (New York) | 2,170.42 mi (3,492.95 km) |
| Ontario to Derby (Connecticut) | 2,458.32 mi (3,956.28 km) |
| Ontario to Derby (Kansas) | 1,163.63 mi (1,872.69 km) |
| Ontario to Des Moines (Iowa) | 1,403.71 mi (2,259.05 km) |
| Ontario to Des Moines (Washington) | 954.46 mi (1,536.06 km) |
